* Create separate `Retry-After` files for proxies
Bad proxies are able to send a false `Retry-After` header and affect the availability of feeds (domain-wide) for other users.
This PR starts including the address of the proxy if present in filenames for `Retry-After` to mitigate the issue.
* Reduce code changes
* Sync SimplePie fork
https://github.com/FreshRSS/simplepie/pull/62
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Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>
* Implement support for HTTP 429 Too Many Requests
Will obey the corresponding HTTP `Retry-After` header at domain level.
* Implement 503 Service Unavailable
* Sanitize Retry-After
* Reduce default value when Retry-After is absent
And make configuration parameter
* Retry-After also for favicons