headers: Rule.SetFunc computes headers per request #42

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mikluko merged 1 commit from feat/setfunc into main

2026-10-26 21:43:07 +00:00

mikluko commented

2026-10-26 21:41:16 +00:00

Owner

Closes #40.

Implements the proposal as written. Rule.SetFunc runs per matching request, after Delete and Set. Its headers replace existing ones as Set's do. It gets the request with its context, and a nil result changes nothing.

An error fails closed: the client gets 502 Bad Gateway with a generic body, the request is not forwarded, and the error goes to the server log through the log helpers with the host. Caching is left to the function, as the issue settled. The CLI flags are unchanged.

The header-rewriting how-to gains a section with the issue's example.

Closes #40. Implements the proposal as written. `Rule.SetFunc` runs per matching request, after `Delete` and `Set`. Its headers replace existing ones as `Set`'s do. It gets the request with its context, and a nil result changes nothing. An error fails closed: the client gets `502 Bad Gateway` with a generic body, the request is not forwarded, and the error goes to the server log through the `log` helpers with the host. Caching is left to the function, as the issue settled. The CLI flags are unchanged. The header-rewriting how-to gains a section with the issue's example.

mikluko added 1 commit

2026-10-26 21:41:16 +00:00

headers: Rule.SetFunc computes headers per request

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ef2b17ed3e

For values a fixed http.Header cannot hold: short-lived tokens, credentials
chosen by the request, values from a secret store. An error fails closed with
502, so the request never goes upstream without the header the rule was meant
to set.

Closes #40

mikluko merged commit 4fafe0cc3d into main

2026-10-26 21:43:07 +00:00

mikluko deleted branch feat/setfunc

2026-10-26 21:43:07 +00:00

mikluko referenced this pull request from a commit

2026-10-26 21:43:08 +00:00

Merge pull request 'headers: Rule.SetFunc computes headers per request' (#42) from feat/setfunc into main