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[BUG][Java][Spring] Make HTTP header matching case insensitive

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
82/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
java, spring
Domain
backend

Research direction

Open modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java near the implicitHeadersRegex definition linked in the issue. Check the regex construction and nearby tests, then make matching case insensitive. Done means header matching works regardless of capitalization and the relevant tests pass.

Written by the indexing model from the issue text.

Description

Issue: Bug

HTTP headers are case insensitive. We should make implicitHeadersRegex be case insensitive. Otherwise, users have to discover the implementation is not case insensitive, usually a bit too late after debugging some issue.

https://github.com/OpenAPITools/openapi-generator/blob/v7.26.0/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java#L2875

For example, by adding the case insensitive flag.

Dominant language
Java
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Avg merge
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Merged PRs (30d)
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