* headers: Check each ? default on its own and keep the response matcher
Several ? defaults in one header block shared one require, so a single
field already set on the response blocked all of them. A match in the
block was also dropped for the ? fields, so they were set on every
response.
* headers: Reject a response matcher on a field that also has a ? default
A ? default already requires its field to be absent, so a match on the
same field in that block could only be dropped or never be true. It is
now a Caddyfile error.
* headers: Test that the last ? default for a field wins
* headers: Allow an absence matcher on a field with a ? default
`match header !X-Test` asks for what `?X-Test` already requires, so it
loads again. Only a matcher that needs a value on that field is an error.
A password piped with a Windows line ending was hashed with the trailing
\r, so basic_auth rejected the real password, and input without a final
newline failed with EOF.
* fastcgi: derive SCRIPT_FILENAME from the normalized request path
Path matchers evaluate a normalized request path — MatchPath applies
normalizeWindowsPath and then CleanPath before comparing — but the FastCGI
transport split r.URL.Path verbatim. Caddy does not rewrite r.URL.Path itself,
so the two disagreed whenever the path contained dot segments after the split
token: /admin.php/../../other.php was matched as /other.php while
SCRIPT_FILENAME resolved to <root>/admin.php, and on Windows the same held for
/admin.php\..\other.php. A route gated by a path matcher could therefore execute
a script that matcher never evaluated.
php_fastcgi generates a rewrite route that normally normalizes the path first,
but that route can fail to match, so the transport establishes the invariant
itself rather than inheriting it. The reason it can fail to match is addressed
in the following commit; this change does not depend on it.
caddyhttp.NormalizedPath is added so a consumer acting on a path a matcher has
already judged derives it exactly as the matcher did, rather than reassembling
the two steps and risking drift.
Scope — two divergences of the same class are NOT addressed here:
* SCRIPT_NAME remains a prefix of the request path, so a matcher naming a
script exactly (path /admin.php) is still reachable via PATH_INFO at
/admin.php/anything. Matchers protecting a script need a trailing wildcard
regardless; that is inherent to CGI, not to this bug.
* On Windows, NTFS 8.3 short names are not rejected here. fileserver's
ServeHTTP rejects them (and ':' for ADS) precisely because matchers cannot
see through them, so GET /ADMIN~1.PHP is judged as /admin~1.php by a
path matcher while NTFS resolves SCRIPT_FILENAME to admin.php. Closing that
means sharing fileserver's hasWindowsShortName across packages, which is a
larger change than this fix; it is reported alongside this one and a patch
is available on request.
Side effects: PATH_INFO and DOCUMENT_URI are now derived from the normalized
path, so repeated slashes are merged and "." segments removed (/index.php//a//b
yields PATH_INFO=/a/b rather than //a//b), and on Windows per-component trailing
dots and spaces are folded. An application routing on a raw PATH_INFO will see
this. An empty URL.Path stays empty rather than becoming ".". REQUEST_URI is
unchanged and still carries the original target.
Tests: a buildEnv regression over literal and percent-encoded dot segments,
covering that legitimate PATH_INFO is preserved and an empty path stays empty; a
Windows-only counterpart whose cases each fail without the Windows
normalization; and an end-to-end test of a basic_auth-protected php_fastcgi
route against a FastCGI responder reporting the SCRIPT_FILENAME it received. The
end-to-end test uses `index off` so no rewrite route exists, ensuring it
exercises the transport rather than the rewrite.
* fileserver: make first_exist_fallback fall back when the file is absent
The try_policy first_exist_fallback is documented to match unconditionally,
falling back to the last try_files entry when no earlier candidate exists. It
did not: candidates are built with fs.Glob, which returns only paths that exist,
so an absent final entry left the list empty and the fallback branch — nested
inside the loop over that list — was unreachable.
php_fastcgi hard-codes this policy so its generated rewrite route always runs;
when the fallback failed, that rewrite was silently skipped.
Keep the pattern itself as a candidate when nothing globbed. This also aligns
Linux with Windows, where globResults is populated without an existence check
and the fallback already fired.
Behaviour change worth calling out: on a php_fastcgi site whose root has no
index.php (or no file matching the configured index), the rewrite now always
runs, so a request for a path that exists neither on the filesystem nor as a PHP
script is proxied to the backend as <root>/index.php instead of falling through
to file_server and returning 404. That is what the documented fallback promises,
but for a site of standalone .php scripts plus static assets it is a visible
change: unmatched requests now reach PHP-FPM.
The other try policies still test existence explicitly, so a candidate that does
not exist is skipped — but note this applies to ANY pattern that expands to
nothing, not only a malformed glob: a file whose literal name contains glob
metacharacters can now match under first_exist, largest_size and smallest_size
where previously globbing found it only via expansion.
* fileserver: synthesize the literal candidate only for the fallback entry
Address review: the previous commit appended the pattern itself as a
candidate inside makeCandidates whenever globbing found nothing. Since
makeCandidates is shared by every try_policy, first_exist, largest_size,
smallest_size and most_recently_modified could then stat the literal
pattern, so a file whose name contains glob metacharacters (for example
"lit[1].txt") matched where it did not before.
Restore makeCandidates to its original behaviour and build the literal
candidate only for the final entry of first_exist_fallback, the one
entry that is documented to match unconditionally. Placeholders in that
entry are expanded without glob escaping, since nothing is globbed, so
a request for /a[b].txt falls back to /a[b].txt rather than /a\[b].txt.
The path is still cleaned and joined with SanitizedPathJoin, so it
cannot escape the root.
This supersedes the last paragraph of the previous commit message: the
other policies now behave exactly as they did before that commit. The
php_fastcgi behaviour change described there still applies.
Add a regression test that creates a file literally named "lit[1].txt"
and checks that only the fallback entry of first_exist_fallback matches
it by its literal name, including the split_path remainder.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
* fastcgi: add license headers to new test files
Address review: phpfastcgi_test.go and fastcgi_windows_test.go were
added without the Apache license header used across the codebase. On
the Windows test, the header goes above the build constraint, matching
replacer_fuzz.go.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
* fastcgi: avoid hardcoded Unix paths in dot-segment tests
Address review: the new tests compared SCRIPT_FILENAME against strings
with forward slashes ("/srv/other.php", a "/admin.php" suffix), but the
transport makes the root absolute and joins it with filepath.Join, so
on Windows the value is C:\srv\other.php and the assertions would fail.
Use a temporary directory as the root and build the expected paths with
filepath instead.
Also lower the bcrypt cost of the integration test's basic_auth hash to
the minimum. At cost 14 the authenticated request exceeded the 5s test
client timeout under -race.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
A CGI script that redirects by printing only a Location header got a
200 response with that header, which clients do not follow. RFC 3875
section 6.2.3 says the server sends 302 Found for this response, and
net/http/cgi, nginx and Apache do so.
With request_buffers or response_buffers set to unlimited, the error
from reading the body was discarded and whatever had been read was
treated as the complete body. A request cut short by request_body
max_size was forwarded truncated with a 200, and a truncated chunked
upstream response was sent to the client as complete.
Handle a read error the same way the limited case already does.
* templates: avoid zero content length for bodyless responses
Drop Content-Length for HEAD and statuses that cannot carry a body instead of using the empty template buffer length. Continue setting the rendered length for ordinary responses.
AI-assisted-by: Jcode (OpenAI)
* templates: test Content-Length for HEAD, 204 and 304 responses
* templates: omit Content-Length for 2xx responses to CONNECT
RFC 9110 section 8.6 forbids Content-Length in any 2xx response to
CONNECT. Non-2xx CONNECT responses still report the rendered length.
* caddy: pass ListenQUIC options as a struct
Collapse the TLS config, packet-conn wrappers, and Allow0RTT arguments
into ListenQUICOptions so the signature matches Listen's ctx/portOffset/
ListenConfig prefix. Zero-value opts keep the historical default of
allowing 0-RTT. The API remains experimental.
* caddyhttp: advertise WebTransport in HTTP/3 SETTINGS
Add github.com/quic-go/webtransport-go dep (built on quic-go, same
maintainers) and call webtransport.ConfigureHTTP3Server on the
http3.Server. This advertises WebTransport enablement in SETTINGS,
enables HTTP/3 DATAGRAMs, and stashes the *quic.Conn in each request's
context — a prerequisite for a later WebTransport-aware handler or
reverse-proxy transport to call webtransport.Server.Upgrade. Also
enable QUIC stream reset partial delivery, required by webtransport-go.
No user-visible behavior change: clients that don't speak WebTransport
ignore the extra SETTINGS, and no handler yet calls Upgrade.
Extract the http3.Server construction into buildHTTP3Server so the
SETTINGS assertions can be unit-tested without a live UDP listener.
* caddyhttp: add UnwrapResponseWriterAs helper
Go's type assertion `x.(T)` does not follow Unwrap() http.ResponseWriter
chains. Caddy wraps the writer multiple times (logging recorder,
intercept, encode, etc.), so code that needs interfaces implemented only
by the raw writer owned by the HTTP server — for example the
http3.Settingser/HTTPStreamer interfaces that webtransport.Server.Upgrade
type-asserts — cannot see through those wrappers.
UnwrapResponseWriterAs walks the Unwrap() chain and returns the first
writer that satisfies the requested interface (or the zero value if none
do). Mirrors the traversal http.ResponseController performs internally.
Used by upcoming WebTransport handler and reverse-proxy transport.
* caddyhttp: add terminating WebTransport handler
Introduces http.handlers.webtransport, an EXPERIMENTAL handler that
terminates an incoming WebTransport session on top of Caddy's HTTP/3
server and echoes bytes on each bidirectional stream. Primary use case
is as a test upstream for the forthcoming WebTransport reverse-proxy
transport; it also serves as the minimal proof that the server-side
WebTransport wiring works end-to-end.
Plumbing changes:
* caddyhttp.Server gains a *webtransport.Server field alongside
h3server. It's built in buildWebTransportServer(), wrapping the
existing http3.Server. Exposed via WebTransportServer() any on the
Server, so the caddyhttp public API does not name the upstream
webtransport-go type (per AGENTS.md).
* serveHTTP3 now runs a custom accept loop (serveH3AcceptLoop) that
dispatches each accepted QUIC connection to
webtransport.Server.ServeQUICConn instead of
http3.Server.ServeListener. The WebTransport server transparently
forwards non-WT streams to the underlying http3 request handler
(cost: one varint peek per stream), so behavior for non-WT clients
is unchanged.
* ListenQUIC enables EnableDatagrams and
EnableStreamResetPartialDelivery on the QUIC listener config.
These are capability bits negotiated during the QUIC handshake and
are prerequisites for any WebTransport session; they do not force
usage so non-WT H3 traffic is unaffected.
* Stop path closes wtServer after h3server.Shutdown to clean up any
remaining WebTransport session state.
The handler uses caddyhttp.UnwrapResponseWriterAs to reach the naked
http3.Settingser/HTTPStreamer writer through Caddy's wrapping chain
before calling webtransport.Server.Upgrade.
Includes unit tests for request-shape detection plus an integration
test (caddytest/integration/webtransport_test.go) that spins up a
Caddy HTTP/3 server with the handler, dials it with a real
webtransport.Dialer, and asserts end-to-end bidirectional-stream
echo.
* reverseproxy: add WebTransport upstream dialer helper
dialUpstreamWebTransport is a thin wrapper around webtransport.Dialer.Dial
that sets the QUIC config flags WebTransport requires (EnableDatagrams,
EnableStreamResetPartialDelivery) and forwards request headers on the
Extended CONNECT. Intended as an internal building block for the
upcoming WebTransport reverse-proxy transport; not yet wired into
ServeHTTP.
Unit-tested against an in-process webtransport.Server with a freshly
minted self-signed certificate. Covers: successful dial, header
forwarding, and connection-refused against an unbound port.
* reverseproxy: add WebTransport session pump
runWebTransportPump bridges two WebTransport sessions so every
bidirectional stream, unidirectional stream, and datagram opened on one
side is mirrored on the other. Uses six goroutines (bidi both ways, uni
both ways, datagrams both ways) and blocks until both sessions end.
Close propagation: when either session ends, the peer is closed via
CloseWithError. The code/message are read from the closing session's
stored close state (by probing AcceptStream with a short timeout),
since Receive{Datagram,UniStream} return the underlying stream error
rather than the SessionError and can win the propagation race. Close
propagation is best-effort for client-initiated close through a
Dialer-dedicated QUIC conn: webtransport-go tears down the QUIC
connection immediately after CloseWithError, so the upstream may
observe a QUIC ApplicationError before the WT_CLOSE_SESSION capsule is
parsed. The pump still closes the peer session; only the specific
error code may not survive.
Not yet wired into ServeHTTP.
Tests: topology of client -> frontend -> upstream where frontend runs
the pump. Exercises bidi both ways, uni client-to-upstream, datagram
round-trip, CloseWithError propagation both ways, and a basic
goroutine-leak check.
* reverseproxy: wire WebTransport pump into ServeHTTP
Extends the http reverse-proxy transport with a webtransport boolean
that opts the upstream into WebTransport passthrough. Must be combined
with versions: ["3"]; WebTransport rides on HTTP/3 exclusively.
When enabled, Handler.ServeHTTP detects Extended CONNECT with
:protocol=webtransport early — before any of the normal round-trip
machinery — and branches to serveWebTransport, which:
1. Pulls the *webtransport.Server off caddyhttp.Server (via
WebTransportServer()) and errors out cleanly if HTTP/3 isn't
enabled on the frontend.
2. Picks a single upstream through the configured load-balancer.
No retries: a failed dial closes the client session and returns.
3. Walks the response-writer Unwrap() chain to reach the raw http3
writer and calls webtransport.Server.Upgrade to terminate the
incoming session.
4. Uses dialUpstreamWebTransport to open a session to the selected
upstream, forwarding request headers on the Extended CONNECT.
5. Runs runWebTransportPump between the two sessions and blocks
until both close.
The transport's wtTLSConfig is built at Provision time from the
existing TLS config (same path h3Transport already uses) and reused
for every session.
Tests: adds TestWebTransport_ReverseProxyEndToEnd which spins up a
single Caddy instance with two HTTP/3 servers — one proxy on :9443,
one terminating echo upstream on :9444 — and drives a real
webtransport.Dialer through the proxy to assert end-to-end
bidirectional-stream echo.
* reverseproxy: add webtransport Caddyfile subdirective
Adds a `webtransport` subdirective to the `transport http {}` block of
reverse_proxy that sets the new WebTransport bool on the transport.
Takes no arguments; exclusivity with versions 3 is enforced at
Provision time so parse order doesn't matter.
Example:
reverse_proxy https://backend:9443 {
transport http {
versions 3
webtransport
tls_insecure_skip_verify
}
}
Includes a Caddyfile-to-JSON adapt test round-tripping the new
subdirective.
* reverseproxy: apply standard request preparation to WebTransport CONNECT
The WebTransport proxy path previously bypassed the request-preparation
pipeline that normal reverse-proxy traffic runs through. Reuse it so
`header_up`, `X-Forwarded-For`/`Host`/`Proto`, `Via`, `Rewrite`, the
`{http.reverse_proxy.upstream.*}` placeholders, dynamic upstreams,
`countFailure`, and the `{http.reverse_proxy.duration{_ms}}` timing
placeholder all behave the same as on the regular path.
Retries, `handle_response`, and response-header ops are intentionally
not run here — a WebTransport session has no HTTP response body to
post-process and is not idempotent. Integration test exercises the
header-forwarding contract end-to-end through a standalone (non-Caddy)
WebTransport upstream so the forwarded Extended CONNECT can be
inspected.
* reverseproxy: dial WebTransport upstream before upgrading client
Reorder serveWebTransport so the upstream is dialed first. If the
upstream is unreachable or refuses the CONNECT, a proper 5xx is returned
from the handler — the client's Dial() surfaces the real status instead
of a successful upgrade followed by an opaque session close.
Also apply `h.Headers.Response` (gated by `Require`, if configured)
against the upstream response status/headers; the ops run on the
client-visible response headers, which webtransport.Server.Upgrade
flushes with the 200 OK. If the client-side upgrade fails after the
upstream dial succeeded, close the upstream session cleanly.
Integration test drives a dial to an unbound loopback port and asserts
the client sees a 5xx status instead of a bare session close.
* reverseproxy: track WebTransport sessions in upstream in-flight counters
Bracket the pump's lifetime with Host.countRequest(±1) and
incInFlightRequest/decInFlightRequest so WT sessions participate in the
same accounting as the normal proxy path:
- MaxRequests gating (Upstream.Full) now blocks WT sessions past the
cap, instead of silently failing open.
- LeastConn / FirstAvailable selection sees WT load, instead of seeing
busy upstreams as idle.
- Admin /reverse_proxy/upstreams reports WT sessions under num_requests.
Integration test holds an upstream session open via a standalone WT
server, polls the admin API to assert num_requests increments during
the session and drops back to 0 after close.
* reverseproxy: extract shared upstream-selection helpers
The WebTransport proxy path in serveWebTransport duplicated the
dynamic-upstream-fallback block and the {http.reverse_proxy.upstream.*}
replacer-variable block from proxyLoopIteration. Francis flagged this
as a maintenance burden in review of #7669.
Extract two helpers:
* resolveUpstreams(r) returns the candidate upstream set — dynamic
when configured (with provisioning + fallback-on-error), static
otherwise. Caller runs the LB selection policy, since the two call
sites diverge on how selection failure is reported (retry loop vs.
fast 502 for long-lived WT sessions).
* setUpstreamReplacerVars(repl, up, di) publishes the seven
placeholders describing the selected upstream.
Both are used by proxyLoopIteration and serveWebTransport with
identical semantics to the inlined code they replace. No behavior
change for either path.
* reverseproxy: inline WebTransport protocol const and writer interface
Francis pointed out in review of #7669 that importing the whole
modules/caddyhttp/webtransport package solely to pull in one constant
and one interface wasn't worthwhile.
Move both into webtransport_transport.go as unexported identifiers
(webtransportProtocol, webtransportWriter). This removes reverseproxy's
dependency on the caddywt package and clears the way for moving the
echo handler itself out of the production module tree.
No behavior change.
* caddyhttp: move WebTransport echo handler to integration tests
Francis pointed out in review of #7669 that the echo handler — which
exists solely as a test upstream for the WebTransport reverse-proxy
tests — should not be a full-fledged module registered in every Caddy
binary. Mirroring the mockdns_test.go pattern, move it into a _test.go
file under caddytest/integration/.
The module ID http.handlers.webtransport is now registered only when
the integration test binary is built, which is when
caddytest/integration/webtransport_test.go references it by ID string
in its JSON configs. Production Caddy builds no longer include it.
Changes:
* New file: caddytest/integration/webtransport_echo_test.go —
contains the WebTransportEcho handler, its types and interface
guards, the isWebTransportEchoUpgrade helper, and the unit tests
that used to live in the deleted package's handler_test.go.
* Deleted: modules/caddyhttp/webtransport/ (handler.go + handler_test.go).
* Removed the blank import from modules/caddyhttp/standard/imports.go.
The Protocol const and Writer interface that this package used to
export were inlined into reverseproxy's own files in a preceding
commit, so nothing else depends on the deleted package.
* caddyhttp, reverseproxy: gate WebTransport behind enable_webtransport server flag
steadytao raised an architectural concern in review of #7669: the PR
put experimental WebTransport handling directly into Caddy's core
HTTP/3 accept path, so every HTTP/3 deployment paid for the feature
whether or not they used it.
Collapse the enablement surface to a single server-level opt-in that
matches Caddy's existing precedent for protocol-level features
(`protocols`, `allow_0rtt`, `enable_full_duplex`), and detect the
request shape at the handler the same way `reverse_proxy` detects a
WebSocket upgrade today — no per-handler config flag.
Core HTTP/3 path changes (modules/caddyhttp/server.go):
* New `EnableWebTransport bool` field on Server, marked EXPERIMENTAL.
* buildHTTP3Server now only calls webtransport.ConfigureHTTP3Server
and sets EnableStreamResetPartialDelivery when the flag is true.
When false, the constructed http3.Server is bit-for-bit identical
to the pre-WebTransport implementation.
* wtServer is constructed only when the flag is true.
* serveH3AcceptLoop falls back to http3.Server.ServeListener when
the flag is false — no varint peek, no per-connection dispatch.
Caddyfile wiring (caddyconfig/httpcaddyfile/serveroptions.go):
* New `enable_webtransport` global server option, modeled on
`enable_full_duplex`.
Reverse-proxy simplifications (modules/caddyhttp/reverseproxy/):
* Removed HTTPTransport.WebTransport field and its Provision-time
exclusivity check (no longer needed; H3 is validated separately).
* Removed the `webtransport` Caddyfile subdirective under
`transport http { }` — this neutralizes the prior commit that
introduced it.
* Removed Handler.webtransportEnabled cache. ServeHTTP now branches
on isWebTransportExtendedConnect(r) alone, matching how the
WebSocket upgrade branch works.
* serveWebTransport gains fail-fast guards with clear errors when
the parent server has enable_webtransport=false or when the
handler's transport does not include HTTP/3.
Tests:
* Existing TestServer_BuildHTTP3ServerEnablesWebTransport now sets
EnableWebTransport=true explicitly; new
TestServer_BuildHTTP3ServerWithoutWebTransport locks in the
regression guard that flag-off produces the pre-PR http3.Server.
* Integration tests updated: enable_webtransport: true added to
every H3 server block; "webtransport": true dropped from the
reverse_proxy transport JSON (auto-detected now).
* Caddyfile adapt test for the deleted `webtransport` subdirective
is removed; `enable_webtransport` is added to the existing
global_server_options_single adapt test alongside its peers.
No runtime behavior change when enable_webtransport is false. Diff
against master on the core HTTP/3 path is effectively zero in that
configuration.
* caddyhttp: micro-benchmark HTTP/3 server construction with/without WebTransport
Adds a hermetic pair of benchmarks on buildHTTP3Server to provide
quantitative evidence for the claim that deployments with
enable_webtransport=false pay no cost for the WebTransport feature.
Results on Apple M4, go1.25, -count=5:
BenchmarkBuildHTTP3Server_WebTransportOff ~70 ns/op 392 B/op 3 allocs/op
BenchmarkBuildHTTP3Server_WebTransportOn ~144 ns/op 600 B/op 6 allocs/op
The Off path is about half the cost on every dimension, confirming
that the work skipped when the flag is false is the
webtransport.ConfigureHTTP3Server call plus EnableStreamResetPartialDelivery.
Absolute cost is a one-time per-server setup so either branch is
negligible in practice, but the asymmetry locks in a regression guard:
a future refactor that accidentally re-enables the WT configuration
unconditionally would show up as a jump in the Off numbers.
This benchmark does not exercise the per-stream dispatch cost inside
webtransport.Server.ServeQUICConn — that would require a full QUIC
setup to measure in isolation and is follow-up work.
* reverseproxy: collapse WebTransport handler into main proxy loop
The WT path duplicated upstream resolution, LB selection, header ops,
replacer vars, and in-flight counters. Route WT through the shared
ServeHTTP -> proxyLoopIteration -> reverseProxy flow and swap RoundTrip
for a small webTransportHijack that only does WT-specific work (writer
unwrap, upstream dial, client upgrade, pump).
Rename roundtripSucceededError -> terminalError. The existing name
described when it was emitted (after a successful round-trip); the
new name describes its contract with the retry loop (stop looping,
propagate error unchanged). The WebTransport upgrade case is a second
natural caller for that same signal.
Comes with two behavior improvements that fall out of the collapse:
- WT upstream dial failures now surface as DialError, so the loop
can fail over across upstreams like normal proxies (today: 502).
- Passive health checks apply to WT dials (dial-failure countFailure
and UnhealthyLatency on dial duration) via the shared path.
Addresses reviewer feedback that the duplicated setup was a
maintenance risk.
* reverseproxy: inline upstream-resolution helpers back into the proxy loop
The earlier #7669 revision extracted resolveUpstreams and
setUpstreamReplacerVars to share between the WebTransport path and the
normal proxy path. A later commit collapsed the WebTransport path into
the main proxy loop, so the helpers became single-callers — they no
longer earn their abstraction.
Inline both back into proxyLoopIteration. The dynamic-upstream block
absorbs the CachingUpstreamSource cache-reset logic added by #7662,
which was preserved through the rebase.
No behavior change.
* caddyhttp: clarify WebTransportServer doc covers both disabled paths
WebTransportServer returns nil for two distinct configurations:
EnableWebTransport=false on the server, and HTTP/3 not in use. The
prior doc only mentioned the latter. Spell out both, per review.
* reverseproxy: drop nil-logger guard in runWebTransportPump
Production and test callers both pass a non-nil *zap.Logger. The
defensive nil check silently swapped in a no-op logger, which can mask
a real bug at the call site. Document the precondition in the doc
comment instead, per review.
* reverseproxy: use sync.WaitGroup.Go in WebTransport pump
Replace the wg.Add(6) + six "go func() { defer wg.Done(); fn() }()"
calls with sync.WaitGroup.Go (Go 1.25+, the project's minimum
version). Same number of goroutines; less boilerplate.
* caddyhttp: drop defensive checks in UnwrapResponseWriterAs
Per review, the nil-pointer guard and the next == w self-reference
guard defended against shapes that no in-tree ResponseWriter wrapper
produces. Drop both, simplifying the loop. Also remove the
self-reference test that exercised the now-removed guard.
* reverseproxy: use r.URL.RequestURI() to build the WebTransport upstream URL
Replace buildWebTransportUpstreamURL with an inline call to
r.URL.RequestURI() at the single call site. RequestURI handles the
empty-path → "/" fixup and query suffixing already, and uses
EscapedPath so encoded path segments (e.g. %2F) are preserved on the
upstream — fixing a small correctness gap where the previous helper
read r.URL.Path (decoded).
Aligns with how Caddy's normal proxy path lets stdlib render the
outbound request line via URL.RequestURI semantics.
* reverseproxy: use wg.Go in spliceBidi
* reverseproxy: expand SNI placeholders on the WebTransport upstream dial
The normal HTTP/3 path expands placeholders in tls_server_name at dial
time via a custom h3Transport.Dial hook (#7737). The WebTransport path
dials through its own webtransport.Dialer and bypasses that hook, so a
placeholder like {http.request.host} reached the QUIC ClientHello
literally. Expand it in webTransportHijack before dialing, cloning the
shared TLS config so concurrent sessions are unaffected.
Adds an integration test asserting the upstream observes the resolved
SNI rather than the literal "{...}" string.
* reverseproxy: bump webtransport-go to v0.11.0 (WebTransport draft-15)
webtransport-go v0.11.0 implements draft-15, which renames the Extended
CONNECT :protocol token from "webtransport" to "webtransport-h3" (the
server keeps accepting the legacy token for older clients). Detect both
tokens in the reverse-proxy upgrade check and in the test echo handler.
Pulls quic-go v0.59.1 -> v0.60.0, required by webtransport-go v0.11.0;
its only breaking change is requiring Go 1.25 (already met), with no API
changes affecting Caddy core. Also picks up the v0.11.0 fix for a
stream-close race on concurrent session close, relevant to the long-lived
pump.
* caddyhttp: log WebTransport QUIC connection serve errors
* caddy: gate QUIC WebTransport capabilities behind an explicit ListenQUIC parameter
* caddyhttp: fall back to plain HTTP/3 when a reused QUIC listener lacks WebTransport
* caddyhttp: enable WebTransport via a webtransport config object
Replace the enable_webtransport bool with a presence-gated
WebTransportConfig object so later options can be added without
renaming the key. JSON is "webtransport": {}, Caddyfile is
webtransport (optional empty block).
* reverseproxy: use origReq for the client WebTransport upgrade
Upgrade is the client-facing session: CheckOrigin and the CONNECT
shape must come from the downstream request. The upstream-directed
clone remains used for the dial URL, header_up, and SNI expansion.
* reverseproxy: relay WebTransport application protocol negotiation
Parse WT-Available-Protocols from the downstream request, set it on
the upstream Dialer, and copy WT-Protocol from the upstream 200 onto
the client response. The shared webtransport.Server does not select
a protocol of its own, so MOQ/MediaMTX clients receive the upstream's
choice instead of WT_ALPN_ERROR.
* caddytest: skip origin check on standalone WebTransport backends
header_up Host rewrites used by proxy tests would 400 the upstream
Upgrade via CheckOrigin. Test backends are not browsers.
* caddytest: cover MediaMTX Host-rewrite + moqt-19 through the WT proxy
Both of elee's #7669 reports fire together: header_up rewrites Host
(Upgrade must use origReq) and the client offers moqt-19 (the proxy
must relay WT-Available-Protocols / WT-Protocol). A bidi echo after
negotiation proves the session is usable, not just headers.
* caddyhttp: break self-referential Unwrap loops
A wrapper whose Unwrap returns itself would spin forever. Restore the
cycle-break mholt applied on #7669, without bringing back the nil-pointer
guard Weidi asked to drop.
* caddyhttp: close WebTransport sessions before HTTP/3 shutdown
ServeQUICConn waits for active WT sessions, and with the default
eternal grace period HTTP/3 Shutdown would hang until every client
disconnected. Close the WebTransport server first so stop/reload
can drain.
* caddyhttp: serve plain HTTP/3 when a reused listener lacks WebTransport
A pooled QUIC listener created without DATAGRAMs cannot upgrade WT
sessions. Falling back on the WT-configured http3.Server still
advertised SETTINGS the socket cannot honor. Build a separate plain
HTTP/3 server for that listener and assert it omits WT SETTINGS.
* caddyhttp: visit Unwrap writers by pointer identity
Comparing writers with == panics on uncomparable types and only
catches a one-node cycle. Track pointer identity, bound the walk,
and add tests for an uncomparable self-unwrap and an A→B→A cycle.
RecordHijackedStatus lets Upgrade write through the naked HTTP/3
writer while the access-log recorder still observes the 200.
* reverseproxy: honor prepared Host, header_down, and WT bookkeeping
Dialer.Dial always sets Host from the URL, so header_up Host never
reached the upstream. Dial the real address via DialAddr and put
the prepared Host on the CONNECT.
Parse WT-Available-Protocols from the prepared request so header_up
applies to negotiation. Copy filtered upstream response headers
before header_down, record the hijacked 200 for access logs, and
run the same latency / circuit-breaker / passive-health path as
a normal round-trip.
* caddytest: cover WT reload, access-log status, Host, and header ops
Reload with an eternal grace period must close an in-flight session.
Access logs must record 200 after Upgrade. header_up Host and
WT-Available-Protocols must reach the upstream; header_down and
non-hop upstream headers must reach the client.
* reverseproxy: build WebTransport against quic-go v0.63
webtransport-go v0.13.0 renames Dialer to Transport. v0.11.1 does not
compile against quic-go v0.63.
* reverseproxy: close the upstream body when a WebTransport dial fails
Dial can return a response with an error when the peer rejects the
CONNECT. Close that body before the error is returned.
* caddyhttp: close WebTransport sessions without closing the HTTP/3 server
webtransport.Server.Close also closes the shared HTTP/3 server and aborts
every QUIC connection before the grace period applies. Close the registered
sessions, then let HTTP/3 shutdown drain ordinary requests.
* chore: modernise
Signed-off-by: Zen Dodd <mail@steadytao.com>
* reverseproxy: preserve WT-Available-Protocols across upstream retries
The proxy loop reuses the request and only recopies headers when header
ops are configured. Deleting the offer on that map hid it from the next
upstream.
* caddyhttp: close WebTransport sessions when the grace period ends
Eternal grace leaves an active session until the peer ends it. A
configured grace period closes it at the deadline, while the socket
is still up, so the close capsule can be delivered.
* reverseproxy: use terminalError when refusing an Incremental response
The proxy-loop collapse renamed roundtripSucceededError to terminalError.
Master's Incremental refusal still returned the old type, so the rebased
package did not compile.
* caddyhttp: don't let idle HTTP/3 conns pin WebTransport shutdown
- Count in-flight requests on ServeQUICConn connections and close idle ones when shutdown starts
- Delay that close by a second so a just-finished response can be read
- Retain plain HTTP/3 fallbacks for listeners without datagrams and shut them down with the same grace period
* reverseproxy: wait for WebTransport stream workers
- Join bidi and uni splice workers after the accept loops return
- Cancel the opposite copy on a hard splice error
---------
Signed-off-by: Zen Dodd <mail@steadytao.com>
Co-authored-by: tomholford <tomholford@users.noreply.github.com>
Co-authored-by: Zen Dodd <mail@steadytao.com>
* reverseproxy: extract DNS SRV+A discovery into a reusable package
Move the SRV and A/AAAA resolution + caching logic out of reverseproxy
into a new, transport-neutral package (dynamicupstreams) that returns
neutral targets instead of *reverseproxy.Upstream. reverseproxy's
SRVUpstreams and AUpstreams now delegate to it and build their own
upstreams from the targets; behavior is unchanged.
This lets other proxies (e.g. third-party layer4 proxies) reuse the same
DNS discovery + caching instead of copying it, reducing duplication and
maintenance burden. reverseproxy/upstreams.go shrinks substantially.
RFC for the de-duplication discussed in caddyserver/caddy-l4#429.
* test(dynamicupstreams): cover ResetAllSRV, filtered records, cache bound, concurrent refresh
Brings the package to 96.8% statement coverage. Adds:
- TestResetAllSRV: full-cache drop
- TestSRVFilteredRecords: LookupSRV partial-error semantics (usable
records returned, error downgraded to a warning)
- TestSRVCacheBound / TestACacheBound: eviction keeps the cache bounded
at maxCacheEntries
- TestSRVConcurrentRefreshDeduplicates / TestAConcurrentRefreshDeduplicates:
two goroutines missing the read-lock fast path trigger only one lookup
(verified under -race)
The grace-period and filtered-records logs now use a level-enabled logger
so the log-write branches execute. The only uncovered statements are the
two double-checked-locking re-check returns, which are reachable solely in
a narrow race window (the same untested idiom as reverseproxy's SRV/A).
* reverseproxy: move DNS SRV+A discovery into modules/internal/network
Per review feedback, the shared discovery code does not belong in a
top-level package: it is internal helper code, not part of Caddy's
runtime surface. Move it from the top-level dynamicupstreams package into
the existing modules/internal/network package and update reverse_proxy's
upstreams.go to consume it from there.
Being under modules/internal means third-party modules (e.g. layer4)
cannot import it yet; they keep their own copy until layer4 is part of
Caddy's standard distribution, at which point they can switch over.
* test(dynamicupstreams): correct the concurrent-refresh test's claim
The two concurrent-refresh tests documented themselves as covering the
write-lock re-check branch ("the second re-checks under the write lock"),
but they do not: while the first goroutine holds the write lock the second
cannot acquire the read lock either, so by the time it acquires srvMu the
cache is already populated and it is served by the read-lock fast path. The
50ms sleep was presented as letting the second goroutine "queue on the write
lock" but proved nothing.
Make the comments and failure messages honest: these tests assert
deduplication (two concurrent callers for one uncached key share a single
lookup) and, under -race, race-safety on the shared cache -- not a specific
locking branch. Ordering is enforced by the channels, so the sleep is removed.
No production code change.
* reverseproxy: preserve DNS discovery logging and grace behavior
Keep refresh and discovery logs in the DNS lookup path, retaining the original SRV field types. Preserve error suppression when an SRV lookup fails with grace enabled before any result has been cached.
Add regression tests for refresh-only logging and cold-cache grace handling.
AI-assisted-by: OpenAI Codex (GPT-6)
---------
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
* caddyhttp: Combine repeated expression matchers in a matcher set
The Caddyfile parser groups repeated matchers of the same type and hands
all their segments to the module, but the expression matcher only read
the first segment, so every later `expression` line in a named matcher
or `not` block was dropped without an error. Read every segment and AND
the expressions, like the other matchers in a set.
* caddyhttp: Put each joined expression on its own line
A trailing // comment in one expression no longer swallows the closing
parenthesis and the expressions joined after it.
* caddyhttp: Reject repeated expression matchers instead of joining them
A second expression line in a named matcher or a not block is now a
Caddyfile error that points to combining them with && in one expression,
instead of being dropped or joined with an implied operator.
* caddyhttp: Skip matchers of grouped routes once the group is satisfied
* caddyhttp: Test that a skipped grouped route keeps regexp captures
A later rewrite in the same group must not run its path_regexp matcher
and overwrite {re.x.1} from the rewrite that was used.
* caddyhttp: preserve expired request-body read deadlines
* caddyhttp: retain only expired drain deadlines
Track the last successfully installed read deadline and retain it after a terminal timeout only when draining is enabled and the deadline has expired. Failed deadline changes preserve the previous installed value.
Cover early and wrapped timeouts, non-draining requests, failed deadline installation and replacement, and cleanup retries.
* caddyhttp: shorten installed deadline field name
* reverseproxy: Only retry responses for expressions that use response data
Since #7569 every lb_retry_match set with an expression is evaluated against
upstream responses. An expression that only tests the request, such as
{http.request.method} == "POST", then matched every successful response:
the request was sent again to the next upstreams and the client got a 502
once retries ran out. Only treat expressions referencing {rp.*} placeholders
as response conditions.
* reverseproxy: Only count placeholders set from the response as response data
* reverseproxy: Read response placeholders from the checked expression
The expression matcher records the placeholder names its checked CEL
expression reads, so retry_match finds direct ph() calls and ignores
escaped placeholder text in string literals. A placeholder name only
known at evaluation time counts as response data.
* reverseproxy: Match response placeholder names exactly
Only the header placeholders are matched by prefix now, and both
upstream latency placeholders are listed. MatchExpression.Placeholders
returns a copy, so callers cannot change the provisioned matcher.
* caddyhttp: ignore case when matching hosts in logger_names
* caddyhttp: test case-insensitive logger_names through App.Provision
* caddyhttp: test case-insensitive logger_names in integration harness
* encode: Don't write an empty encoded stream for HEAD responses
When nothing was written (e.g. a HEAD request), Close() still closed the
encoder, which wrote the empty stream trailer to the client. The server
then set Content-Length to that size (20 for gzip, 13 for zstd) instead
of omitting it as for the matching GET response.
* encode: Check resp.ContentLength in the HEAD test
* encode: Track body writes to decide whether to close the encoder
* reverseproxy: Keep own headers after 1xx responses
Since #6656 the 1xx handler clears the whole header map after writing the
informational response, which also drops headers set before proxying (for
example by the header handler). Restore those after clearing, as #5091 did.
* reverseproxy: Use maps.Copy to restore own headers
* reverseproxy: Check the 103 reaches the client in the 1xx headers test
Wrap backend dial failures as reverseproxy.DialError so non-GET requests can be retried when no connection was made.
AI-assisted implementation and test; reviewed by zemamba.
Signed-off-by: zemamba <zemamba@gmail.com>
* templates: Delete file headers on any template error
A template that fails to parse or execute (not only {{httpError}}) left
the Content-Length, Etag and related headers set by file_server on the
error response, so clients received a 500 that declared the file's size
but had no body.
* templates: Also delete Content-Encoding and Content-Range on errors
Precompressed and ranged file responses could leave these headers on the
replacement error response.
A handler setting a write deadline through http.ResponseController
reached the connection directly, and the next Write or Flush through
IdleTimeoutWriter replaced it with now+write_idle_timeout. Handlers
bounding a single write, like Mercure's dispatch_timeout, which drops
SSE subscribers that can't receive an update within 5s, were silently
extended to the 1 minute default. On HTTP/2, clearing between writes
also wiped the handler deadline.
IdleTimeoutWriter now implements SetWriteDeadline, keeps the handler
deadline as a ceiling for idle resets, and restores it instead of
HardDeadline alone when clearing between writes. A handler can
tighten the idle timeout but not loosen it.
directoryListing built each symlink's lookup path from the escaped
request path. In a directory whose name needs escaping, such as one with
a space, the stat failed, so directory symlinks were listed as files,
file symlinks showed the link's own size, and reveal_symlinks showed no
target.
Use the decoded path, which the function already computes for the page
title. The escaped path is still used for the page path and item URLs.
read_idle_timeout and write_idle_timeout default to 1 minute when zero,
and the wrappers are only installed for positive values, so a negative
value already disables them. Document it and cover it with tests, since
it is the only way to opt out, for instance behind a reverse proxy that
already protects from slow clients.
* caddyhttp: only bound HTTP/2 body reads in flight with the idle timeout
On HTTP/2, the read deadline is a timer that fails the request body
when it fires, even with no read in flight. IdleTimeoutReader left the
idle deadline armed between reads, so a handler that stopped reading
for longer than read_body_idle (1 minute by default) lost the body,
although the client was only held back by flow control. For example,
reverse_proxy uploading to an upstream that's slow to accept the body
failed with a 502.
This is the read side of #8118. Like IdleTimeoutWriter does since
read on HTTP/2, so the idle deadline only bounds reads in flight. A
client that stops sending is still cut off, since the deadline is set
before each read. HTTP/1 and HTTP/3 only check the deadline during a
read, so they're unchanged.
Written with Claude Code (Claude Opus 5.5); the human submitter is
responsible for reviewing it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* caddyhttp: track a released hard read deadline as armed
From review: with HardDeadline set, releasing the idle deadline between
reads left an HTTP/2 timer armed (at HardDeadline) while deadlineSet
recorded that none was, so clearDeadlineLocked would skip clearing it.
Track which deadline is armed (none, idle, or only the hard one) instead
of a bool, and have each check ask the question it means: re-arming and
releasing only apply to an armed idle deadline, while clearing applies
to any.
The writer's deadlineSet already only means "idle deadline armed",
since nothing clears the hard deadline it leaves; document that.
Written with Claude Code (Claude Opus 5.5); the human submitter is
responsible for reviewing it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* caddyhttp: clear released hard deadline at handler end, skip no-op sets
From review:
- After a partial read releases the idle deadline to HardDeadline, a
handler that returns without reading again left that timer armed past
HandlerDone, which only cleared after a terminal error. HandlerDone
now also clears a released hard deadline.
- When the idle deadline is capped to HardDeadline, the reader and
writer set the same deadline again when releasing it, and the writer
once more in HandlerDone. On HTTP/2 each is a message to the serve
loop. Both now remember the deadline they armed and skip setting it
again. Within a request, only these wrappers set the client's
deadlines.
Replaces the earlier test that faked a terminal error with the partial
read followed directly by HandlerDone.
Written with Claude Code (Claude Opus 5.5); the human submitter is
responsible for reviewing it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* caddyhttp: only skip re-setting an armed hard deadline
Skipping any deadline equal to the one already armed also skipped idle
deadlines on Windows, where two calls to time.Now in the same clock tick
return the same time, so successive idle deadlines can be equal. That
broke tests counting deadline calls there. Only skip HardDeadline, the
case from review where the idle deadline is capped to it; other
deadlines are always set.
Written with Claude Code (Claude Opus 5.5); the human submitter is
responsible for reviewing it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* caddyhttp: restore deadlines without trusting cached transport state
Always set the requested read and write deadlines because another handler can change them through its own response controller. Remove the armedAt shortcut and cover intervening deadline changes for reads, writes, ReadFrom, flushes, and HandlerDone.
AI-assisted with OpenAI Codex (GPT-6); tested under human direction.
---------
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Since #7017, every *fs.PathError from stat becomes fs.ErrInvalid, and
that includes ENOTDIR. So a request like /index.php/foo got 400 instead
of 404, and pass_thru no longer fell through to the next handler.
Map ENOTDIR to fs.ErrNotExist before that check. Other path errors, such
as NUL bytes, overly long names, or transient I/O failures, keep their
current handling.
* reverseproxy: Optionally detach stream (websockets) from config lifecycle
* lint
* Improved logging facilities
* Adjustments from Weidi's review
* record bytes read and written for response writers unless detached
* simplify streaming handling
* correctly close detached streams
* make handleUpgradeTunnel a standalone func
* fix tests
* fix tests
* change the log level if hijacking without writing a status code first
* only clean up connections when stopped
* Move type and const down to the bottom
* Rename to tunnelTracker, reflow some comments
* Add note about capturing h
* Rename to stream_detached
* More comments
* reverseproxy: Preserve half-close behavior after rebase
Keep master half-close propagation and its unit coverage in the refactored tunnel lifecycle. Adapt response finalization tests to the selected upstream argument.
AI-assisted-by: Codex (GPT-6)
* reverseproxy: Fix detached stream cleanup and recorder chains
Snapshot the tracker registry before closing connections, and unregister empty trackers outside their mutex. Mark trackers stopped at cleanup entry so upstream removal closes detached streams even with stream_close_delay, while attached streams retain their delay.
Detach every supported response writer in the middleware chain so inner recorders do not retain state or count detached traffic. Add regressions for all four failures and an access-log/encode/intercept reload integration test.
AI-assisted-by: Codex (GPT-6)
---------
Co-authored-by: WeidiDeng <weidi_deng@icloud.com>
* timeouts: take precedence over server-wide and enclosing idle timeouts
The timeouts handler wrapped the request body and response writer again,
on top of the server's own idle timeout wrappers. The wrapper closest to
the connection sets the deadline last, so the server-wide read_body_idle
and write_idle (on by default since 2.11.6) silently overrode the
route's settings. The same happened between nested timeouts handlers,
where the outer, less specific one won.
The server now makes its idle timeout wrappers available through the
request context, and the timeouts handler overrides their settings while
it runs, restoring them when it returns. It only wraps when there's
nothing to override, and then registers its own wrappers so that nested
handlers override those. The server-wide read_timeout and write_timeout
still cap the whole transfer. A handler that doesn't set
max_write_chunk keeps the server-wide one.
Written with Claude Code (Claude Opus 5.5); the human submitter is
responsible for reviewing it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* timeouts: re-arm deadlines on override and suspend outer min-rate window
From review:
- On HTTP/2, a read or write deadline is a timer that fires even with
no read or write in flight. A deadline armed before a timeouts handler
started kept the outer timeout and could fail the body (or reset the
stream) inside a longer inner scope before the next read reset it.
Override and restore now move an armed deadline to the settings that
apply.
- Time spent under an override counted against the outer MinRate
window, so the restored deadline could already have expired. The
outer window is now suspended while overridden: its start moves
forward by the time spent overridden, and bytes transferred in the
meantime don't count towards it.
Adds an HTTP/2 read-before-inner-scope regression test and nested
minimum-rate coverage.
Written with Claude Code (Claude Opus 5.5); the human submitter is
responsible for reviewing it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
CertMagic assembles an event's data before emit() can look at OnEvent,
because Go evaluates arguments first, so tls_get_certificate costs a map
and a ClientHello copy on every handshake even when nothing will read
them. caddyserver/certmagic#406 added Config.ShouldEmitFunc so an
embedder can answer that question first.
Export App.ShouldEmit and pass it along with OnEvent. The predicate has
to account for every observer, not just subscribed handlers: Emit writes
a debug line for each event, so an event is observable whenever debug
logging is on. Emit now asks the same method it exports, so the two
cannot drift.
Benchmarks are included; measurements are in the pull request.
With the Go 1.26 floor, golangci-lint's modernize analyzer (errorsastype)
flags the three errors.As calls that look for RequestBodyLimitError, which
turned the Lint workflow red on master after #8056. Replace them with the
generic errors.AsType; behavior is unchanged.
Assistance disclosure: this change was made by an AI agent (Claude Sonnet
5.5, model ID claude-sonnet-5-5) acting as Matthew Holt's agent and under
his approval. Build, go vet and the caddyhttp and caddyhttp/templates tests
pass locally; golangci-lint itself was not run locally.
Co-authored-by: Claude Code <noreply@anthropic.com>
Track pending HTTP server shutdowns across configuration reloads so
termination waits for responses still served by an older configuration.
Bound that wait by the terminating app's grace period and retain each
reload's grace context until its servers finish shutting down.
Cover HTTP/1.1, HTTP/2, and finite termination grace periods with
regression tests.
steadytao