This one might be better for review as it's more complete, also implements del-headers-bin, has a filter for headers that shouldn't be touched, has documentation and fixes some bugs in the first one.
Regards, Nenad On Tue, Feb 3, 2026 at 1:47 AM Nenad Merdanovic <[email protected]> wrote: > > Hello, > > I would like to discuss the possibility of adding a feature to set/add > multiple headers in the same http-request/response command and the > best way to implement that. > > The main driver behind this is being able to return any number of > headers with names unknown in advance from SPOA that would then be set > by HAProxy, both upstream and downstream. > > A consideration has to be made that some headers must not be reset. > The list I came up with is: connection, content-length, expect, > keep-alive, proxy-authenticate, proxy-authorization, proxy-connection, > trailer, transfer-encoding, upgrade. If anyone has any additions, > please let me know. > > I made a very rough patch that seems to do what I want it to do, but > lacks boundary checking and header name filtering, etc. Figured I'd > get some comments before spending too much time on this. The patch > adds two new keywords to the HTTP actions, set-headers-bin and > add-headers-bin. The input is a base64 encoded string created by > varint encoding the headers, ie. the same encoding used by > req.hdrs_bin. Also now I noticed the patch doesn't properly free > "decoded" trash chunk, but that will be fixed before I send a final > patch, so it can be ignored. > > Quick test I made with this config: > http-request set-var(txn.oldheaders) req.hdrs_bin,base64 > http-request del-header Accept > http-request del-header User-Agent > http-request del-header Host > http-request set-headers-bin %[var(txn.oldheaders)] > http-request set-var(txn.endheaders) req.hdrs_bin > http-after-response set-header Old %[var(txn.oldheaders)] > http-after-response set-header End %[var(txn.endheaders)] > > Seems to show expected results, as the deleted headers are correctly restored: > > HTTP/1.1 200 OK > content-length: 0 > old: > BGhvc3QPbG9jYWxob3N0OjEwMDAwCnVzZXItYWdlbnQLY3VybC84LjExLjEGYWNjZXB0AyovKgAA > end: %04host%0Flocalhost:10000%0Auser-agent%0Bcurl/8.11.1%06accept%03*/* > > Regards, > Nenad
0001-MEDIUM-Add-set-headers-bin-add-headers-bin-and-del-h.patch
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