fix: return correct header keys for each integration #877
Conversation
This file contains 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
fluxth
commented
May 16, 2024
| // API gateway v2 doesn't have multiValueHeaders field. Duplicate headers are | ||
| // combined with commas and included in the headers field. | ||
| headers: headers, | ||
| multi_value_headers: HeaderMap::new(), |
There was a problem hiding this comment.
This field should probably be removed from ApiGatewayV2httpResponse struct but for simplicity of this fix I'm going to leave it there for now.
|
Thanks a lot for diving deep in this issue! |
Each integration handle header keys differently, this patch tries to address these differences so that we have proper headers in responses. **ALB Integration** https://docs.aws.amazon.com/elasticloadbalancing/latest/application/lambda-functions.html#multi-value-headers-response The names of the fields used for headers differ depending on whether you enable multi-value headers for the target group. You must use multiValueHeaders if you have enabled multi-value headers and headers otherwise. **APIGW v1 Integration** https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-output-format If you specify values for both headers and multiValueHeaders, API Gateway merges them into a single list. If the same key-value pair is specified in both, only the values from multiValueHeaders will appear in the merged list. **APIGW v2 Integration** https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html Format 2.0 doesn't have multiValueHeaders or multiValueQueryStringParameters fields. Duplicate headers are combined with commas and included in the headers field. Duplicate query strings are combined with commas and included in the queryStringParameters field. **`awslabs/aws-lambda-go-api-proxy` source code** - https://github.com/awslabs/aws-lambda-go-api-proxy/blob/3f6c8160ae0c22b0bd05b2e3a9122736f035c74b/core/response.go#L117 - https://github.com/awslabs/aws-lambda-go-api-proxy/blob/3f6c8160ae0c22b0bd05b2e3a9122736f035c74b/core/responseALB.go#L108 - https://github.com/awslabs/aws-lambda-go-api-proxy/blob/3f6c8160ae0c22b0bd05b2e3a9122736f035c74b/core/responsev2.go#L117
calavera
approved these changes
May 17, 2024
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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.
Description of changes
Fixes #871
Fixes #876
Each integration handle header keys differently, this patch tries to address these differences so that we have proper headers in responses.
Note: I don't currently have time to spin up all these integrations on AWS to test this, so this patch is entirely based on documentation and reference code from awslabs/aws-lambda-go-api-proxy repo. Please feel free to test and leave feedback in the reviews.
References
ALB Integration
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/lambda-functions.html#multi-value-headers-response
APIGW v1 Integration
https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-output-format
APIGW v2 Integration
https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html
awslabs/aws-lambda-go-api-proxysource codeBy submitting this pull request