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* reverseproxy: Fix dial placeholders, SRV, active health checks
Supercedes #3776
Partially reverts or updates #3756, #3693, and #3695
* reverseproxy: add integration tests
Co-authored-by: Mohammed Al Sahaf <msaa1990@gmail.com>
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* reverseproxy: fix breakage in handling SRV lookup introduced by 3695
* reverseproxy: validate against incompatible config options with lookup_srv
* reverseproxy: add integration test cases for validations involving lookup_srv
* reverseproxy: clarify the reason for skipping an iteration
* grammar.. Oxford comma
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
Fixes #3753
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Fixes #3763
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* reverseproxy: construct active health-check transport from scratch (Fixes #3691)
* reverseproxy: do upstream health-check on the correct alternative port
* reverseproxy: add integration test for health-check on alternative port
* reverseproxy: put back the custom transport for health-check http client
* reverseproxy: cleanup health-check integration test
* reverseproxy: fix health-check of unix socket upstreams
* reverseproxy: skip unix socket tests on Windows
* tabs > spaces
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
* make the linter (and @francislavoie) happy
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
* One more lint fix
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
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* reverse_proxy: ensure upstream address has port range of only 1
* reverse_proxy: don't log the error if upstream range size is more than 1
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Now use context cancellation to stop active health checker, which is
simpler than and just as effective as using a separate stop channel.
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* reverse_proxy: fix bi-h2stream breaking gzip encode handle(#3606).
* reverse_proxy: check http version of both sides to avoid affecting non-h2 upstream.
* Minor cleanup; apply review suggestions
Co-authored-by: Matthew Holt <mholt@users.noreply.github.com>
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* reverse proxy: Support more h2 stream scenarios (#3556)
* reverse proxy: add integration test for better h2 stream (#3556)
* reverse proxy: adjust comments as francislavoie suggests
* link to issue #3556 in the comments
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We already restore them within the retry loop, but after successful
proxy we didn't reset them, so as handlers bubble back up, they would
see the values used for proxying.
Thanks to @ziddey for identifying the cause.
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It's a raw, low-level implementation for now, but it's very flexible.
More sugar-coating can be added after error handling is more developed.
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Correct behavior is not well defined because this is a non-standard
header field. This could be a "hop-by-hop" field much like
X-Forwarded-For is, but even our X-Forwarded-For implementation
preserves prior entries. Or, it could be best to preserve the original
value from the first hop, representing the protocol as facing the
client.
Let's try it the other way for a bit and see how it goes.
See https://caddy.community/t/caddy2-w-wordpress-behind-nginx-reverse-proxy/8174/3?u=matt
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This way the upstream request will always be available even if it failed
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https://caddy.community/t/set-cookie-manipulation-in-reverse-proxy/7666?u=matt
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Either Dial or LookupSRV will be set, but if we rely on Dial always
being set, we could run into bugs.
Note: Health checks don't support SRV upstreams.
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* reverse_proxy: Begin SRV lookup support (WIP)
* reverse_proxy: Finish adding support for SRV-based backends (#3179)
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Adds `Alt-Svc` to the list of headers that get removed when proxying
to a backend.
This fixes the issue of having the contents of the Alt-Svc header
duplicated when proxying to another Caddy server.
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Fixes https://caddy.community/t/v2-health-checks-are-going-to-the-wrong-upstream/7084?u=matt
... I think
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Previously, all matchers in a route would be evaluated before any
handlers were executed, and a composite route of the matching routes
would be created. This made rewrites especially tricky, since the only
way to defer later matchers' evaluation was to wrap them in a subroute,
or to invoke a "rehandle" which often caused bugs.
Instead, this new sequential design evaluates each route's matchers then
its handlers in lock-step; matcher-handlers-matcher-handlers...
If the first matching route consists of a rewrite, then the second route
will be evaluated against the rewritten request, rather than the original
one, and so on.
This should do away with any need for rehandling.
I've also taken this opportunity to avoid adding new values to the
request context in the handler chain, as this creates a copy of the
Request struct, which may possibly lead to bugs like it has in the past
(see PR #1542, PR #1481, and maybe issue #2463). We now add all the
expected context values in the top-level handler at the server, then
any new values can be added to the variable table via the VarsCtxKey
context key, or just the GetVar/SetVar functions. In particular, we are
using this facility to convey dial information in the reverse proxy.
Had to be careful in one place as the middleware compilation logic has
changed, and moved a bit. We no longer compile a middleware chain per-
request; instead, we can compile it at provision-time, and defer only the
evaluation of matchers to request-time, which should slightly improve
performance. Doing this, however, we take advantage of multiple function
closures, and we also changed the use of HandlerFunc (function pointer)
to Handler (interface)... this led to a situation where, if we aren't
careful, allows one request routed a certain way to permanently change
the "next" handler for all/most other requests! We avoid this by making
a copy of the interface value (which is a lightweight pointer copy) and
using exclusively that within our wrapped handlers. This way, the
original stack frame is preserved in a "read-only" fashion. The comments
in the code describe this phenomenon.
This may very well be a breaking change for some configurations, however
I do not expect it to impact many people. I will make it clear in the
release notes that this change has occurred.
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The interface was only making things difficult; a concrete pointer is
probably best.
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These will be used in the new automated documentation system
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This commit goes a long way toward making automated documentation of
Caddy config and Caddy modules possible. It's a broad, sweeping change,
but mostly internal. It allows us to automatically generate docs for all
Caddy modules (including future third-party ones) and make them viewable
on a web page; it also doubles as godoc comments.
As such, this commit makes significant progress in migrating the docs
from our temporary wiki page toward our new website which is still under
construction.
With this change, all host modules will use ctx.LoadModule() and pass in
both the struct pointer and the field name as a string. This allows the
reflect package to read the struct tag from that field so that it can
get the necessary information like the module namespace and the inline
key.
This has the nice side-effect of unifying the code and documentation. It
also simplifies module loading, and handles several variations on field
types for raw module fields (i.e. variations on json.RawMessage, such as
arrays and maps).
I also renamed ModuleInfo.Name -> ModuleInfo.ID, to make it clear that
the ID is the "full name" which includes both the module namespace and
the name. This clarity is helpful when describing module hierarchy.
As of this change, Caddy modules are no longer an experimental design.
I think the architecture is good enough to go forward.
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This is a bad idea, but some backends apparently require it. See
discussion in #176.
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* logging: Initial implementation
* logging: More encoder formats, better defaults
* logging: Fix repetition bug with FilterEncoder; add more presets
* logging: DiscardWriter; delete or no-op logs that discard their output
* logging: Add http.handlers.log module; enhance Replacer methods
The Replacer interface has new methods to customize how to handle empty
or unrecognized placeholders. Closes #2815.
* logging: Overhaul HTTP logging, fix bugs, improve filtering, etc.
* logging: General cleanup, begin transitioning to using new loggers
* Fixes after merge conflict
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This PR enables the use of placeholders in an upstream's Dial address.
A Dial address must represent precisely one socket after replacements.
See also #998 and #1639.
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See https://caddy.community/t/http-proxy-and-non-get-retries/6304
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My goodness that was complicated
Blessed be request.Context
Sort of
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These happen when downstream clients cancel the request, but that's not
our problem nor a failure in our end
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