fix(middleware): avoid duplicate CORS headers behind proxies#2983
Open
leno23 wants to merge 1 commit into
Open
fix(middleware): avoid duplicate CORS headers behind proxies#2983leno23 wants to merge 1 commit into
leno23 wants to merge 1 commit into
Conversation
Set CORS response headers after the handler runs for simple requests and skip them when an upstream handler already set Access-Control-Allow-Origin. This prevents duplicated headers when CORS middleware is used together with reverse proxies in chained services. Fixes labstack#2853 Co-authored-by: Cursor <cursoragent@cursor.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Access-Control-Allow-Originand related headers when an upstream handler (e.g. reverse proxy) already set themTest plan
go test ./middleware/...TestCORSNoDuplicateHeadersFromUpstream— proxy layer + upstream both use CORS middleware, response has singleAccess-Control-Allow-OriginandVaryFixes #2853