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docs(deploying/generic): add haproxy host header quirk #2331

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fkszczot commented 2026-10-06 14:18:47 +00:00
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Signed-off-by: Filip Kszczot filip@kszczot.pl

This pull request documents how haproxy handles hdr(host) matching, which can lead to problem with how certain homeservers send it.

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Signed-off-by: Filip Kszczot <filip@kszczot.pl> <!-- In order to help reviewers know what your pull request does at a glance, you should ensure that 1. Your PR title is a short, single sentence describing what you changed 2. You have described in more detail what you have changed, why you have changed it, what the intended effect is, and why you think this will be beneficial to the project. If you have made any potentially strange/questionable design choices, but didn't feel they'd benefit from code comments, please don't mention them here - after opening your pull request, go to "files changed", and click on the "+" symbol in the line number gutter, and attach comments to the lines that you think would benefit from some clarification. --> This pull request documents how haproxy handles hdr(host) matching, which can lead to problem with how certain homeservers send it. <!-- Example: This pull request allows us to warp through time and space ten times faster than before by double-inverting the warp drive with hyperheated jump fluid, both making the drive faster and more efficient. This resolves the common issue where we have to wait more than 10 milliseconds to engage, use, and disengage the warp drive when travelling between galaxies. --> <!-- Closes: #... --> <!-- Fixes: #... --> <!-- Uncomment the above line(s) if your pull request fixes an issue or closes another pull request by superseding it. Replace `#...` with the issue/pr number, such as `#123`. --> **Pull request checklist:** <!-- You need to complete these before your PR can be considered. If you aren't sure about some, feel free to ask for clarification in #dev:continuwuity.org. --> - [x] This pull request targets the `main` branch, and the branch is named something other than `main`. - [x] I have written an appropriate pull request title and my description is clear. - [x] I understand I am responsible for the contents of this pull request. - I have followed the [contributing guidelines][c1]: - [ ] My contribution follows the [code style][c2], if applicable. - [ ] I ran [pre-commit checks][c1pc] before opening/drafting this pull request. - [x] I have [tested my contribution][c1t] (or proof-read it for documentation-only changes) myself, if applicable. This includes ensuring code compiles. - [x] My commit messages follow the [commit message format][c1cm] and are descriptive. <!-- Notes on these requirements: - While not required, we encourage you to sign your commits with GPG or SSH to attest the authenticity of your changes. - While we allow LLM-assisted contributions, we do not appreciate contributions that are low quality, which is typical of machine-generated contributions that have not had a lot of love and care from a human. Please do not open a PR if all you have done is asked ChatGPT to tidy up the codebase with a +-100,000 diff. - In the case of code style violations, reviewers may leave review comments/change requests indicating what the ideal change would look like. For example, a reviewer may suggest you lower a log level, or use `match` instead of `if/else` etc. - In the case of code style violations, pre-commit check failures, minor things like typos/spelling errors, and in some cases commit format violations, reviewers may modify your branch directly, typically by making changes and adding a commit. Particularly in the latter case, a reviewer may rebase your commits to squash "spammy" ones (like "fix", "fix", "actually fix"), and reword commit messages that don't satisfy the format. - Pull requests MUST pass the `Checks` CI workflows to be capable of being merged. This can only be bypassed in exceptional circumstances. If your CI flakes, let us know in matrix:r/dev:continuwuity.org. - Pull requests have to be based on the latest `main` commit before being merged. If the main branch changes while you're making your changes, you should make sure you rebase on main before opening a PR. Your branch will be rebased on main before it is merged if it has fallen behind. - We typically only do fast-forward merges, so your entire commit log will be included. Once in main, it's difficult to get out cleanly, so put on your best dress, smile for the cameras! --> [c1]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md [c2]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/docs/development/code_style.mdx [c1pc]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md#pre-commit-checks [c1t]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md#running-tests-locally [c1cm]: https://forgejo.ellis.link/continuwuation/continuwuity/src/branch/main/CONTRIBUTING.md#commit-messages
docs(deploying/generic): add haproxy host header quirk
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13a125ad43
 
Signed-off-by: Filip Kszczot <filip@kszczot.pl>
silversys requested changes 2026-10-06 17:09:34 +00:00
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docs/deploying/generic.mdx Outdated
@ -199,6 +199,9 @@ header, making federation non-functional. If you find a workaround, please share
Furthermore, Nginx users need to increase the `client_max_body_size` setting (default is 1M) to match the `max_request_size` defined in conduwuit.toml.
- If using HAProxy, your ACL needs to match both server_name.tld and server_name.tld:443, because HAProxy matches the raw Host header, and federation requests often include the port:
silversys commented 2026-10-06 17:09:23 +00:00
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Maybe add backticks around server_name.tld and server_name.tld:443, other than that lgtm

Maybe add backticks around `server_name.tld` and `server_name.tld:443`, other than that lgtm
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fkszczot commented 2026-10-06 18:45:55 +00:00
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Done!

Done!
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silversys requested changes 2026-10-06 18:58:33 +00:00
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@ -199,6 +199,9 @@ header, making federation non-functional. If you find a workaround, please share
Furthermore, Nginx users need to increase the `client_max_body_size` setting (default is 1M) to match the `max_request_size` defined in conduwuit.toml.
- If using HAProxy, your ACL needs to match both `server_name.tld` and `server_name.tld:443`, because HAProxy matches the raw Host header, and federation requests often include the port:
silversys commented 2026-10-06 18:58:31 +00:00
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also backticks to Host in "raw Host header"

then it lgtm

im a bit blind at times

also backticks to `Host` in "raw `Host` header" *then* it lgtm im a bit blind at times
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silversys approved these changes 2026-10-06 19:13:24 +00:00
lveneris approved these changes 2026-10-06 19:16:33 +00:00
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Henry-Hiles approved these changes 2026-10-06 19:19:43 +00:00
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lveneris commented 2026-10-06 19:20:33 +00:00
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note: strat had some comments to make before this can be merged

note: strat had some comments to make before this can be merged
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lveneris reviewed 2026-10-06 21:22:51 +00:00
docs/deploying/generic.mdx Outdated
@ -199,6 +199,11 @@ header, making federation non-functional. If you find a workaround, please share
Furthermore, Nginx users need to increase the `client_max_body_size` setting (default is 1M) to match the `max_request_size` defined in conduwuit.toml.
- If using HAProxy, your ACL needs to match both `example.com` (your `server_name`) and `example.com:443`, because HAProxy matches the raw `Host` header, and federation requests often include the port - this may be fixed by adding the `host_only` option:
lveneris commented 2026-10-06 21:22:51 +00:00
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consider:

For HAProxy, note that it matches the raw `Host` header, and federation requests are often sent with the port. Ensure you accept both the bare domain and the domain with the port by using the `host_only` directive:
consider: ``` For HAProxy, note that it matches the raw `Host` header, and federation requests are often sent with the port. Ensure you accept both the bare domain and the domain with the port by using the `host_only` directive: ```
stratself commented 2026-10-07 16:46:14 +00:00
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consider:

For HAProxy, ensure that the ACL for the `Host` header matches both
the domain and the domain with the port, as federation requests are
often sent with the port included. This can be done by using the
`host_only` directive:
consider: ``` For HAProxy, ensure that the ACL for the `Host` header matches both the domain and the domain with the port, as federation requests are often sent with the port included. This can be done by using the `host_only` directive: ```
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Jade commented 2026-10-12 09:08:39 +00:00
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Is this ready to merge? @stratself @lveneris

Is this ready to merge? @stratself @lveneris
lveneris commented 2026-10-12 09:11:13 +00:00
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we are waiting on comment resolution

we are waiting on comment resolution
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lveneris approved these changes 2026-10-15 08:13:19 +00:00
stratself approved these changes 2026-10-15 08:21:49 +00:00
Jade scheduled this pull request to auto merge when all checks succeed 2026-10-15 18:38:12 +00:00
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