Exception while adding custom response headers from feign
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- Java
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Description
I am looking for enriching the response headers of feign with custom key-value pair through custom ResponseInterceptor class.
However, I am facing UnsupportedOperationException due to UnmodifiableMap.
How do we achieve adding custom response headers with minimal code changes to our microservice?
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing the custom ResponseInterceptor and the response-header handling that produces the reported UnsupportedOperationException from an unmodifiable map. Reproduce the exception in a minimal Feign client, then identify and verify the smallest supported change that allows custom response headers without requiring broader microservice changes.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- api, backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100