fix: remove deleted Anthropic beta header for AWS

[Roland0511]

Summary

• Remove the inherited anthropic-beta header when runtime header overrides are enabled but no replacement anthropic-beta is provided.
• Add AWS relay coverage for deleting the beta header from Bedrock Claude requests.

Why

Runtime header overrides can intentionally remove request headers. The AWS relay copied the incoming anthropic-beta header into the Bedrock payload even when the override map omitted it, so removed beta flags could still be forwarded upstream.

Tests

• go test ./relay/channel/aws -run 'TestDoAwsClientRequest_(AppliesRuntimeHeaderOverrideToAnthropicBeta|RemovesAnthropicBetaWhenRuntimeOverrideDeletesIt)'

Summary by CodeRabbit

• Bug Fixes

  • Fixed header handling to properly remove the anthropic-beta header from outgoing requests when runtime header overrides are configured without explicitly including it.

• Tests

  • Added test case validating correct header removal behavior during runtime override scenarios.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3f2a162a-51be-4272-a171-b556907f3e45

📥 Commits

Reviewing files that changed from the base of the PR and between 5dd0d3b and 49767a5.

📒 Files selected for processing (2)

• relay/channel/aws/relay-aws.go
• relay/channel/aws/relay_aws_test.go

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Walkthrough

When UseRuntimeHeadersOverride is enabled and the override configuration does not include the anthropic-beta header, the code explicitly removes any existing anthropic-beta header from the outgoing AWS request, with a new test verifying the behavior.

Changes

Anthropic-Beta Header Cleanup

Layer / File(s)	Summary
Anthropic-beta header removal and validation relay/channel/aws/relay-aws.go, relay/channel/aws/relay_aws_test.go	When runtime header override is enabled and anthropic-beta is absent from headerOverride, the code removes any existing anthropic-beta entry from requestHeader before applying overrides. Test verifies that the outgoing AWS payload no longer contains anthropic_beta field when runtime override settings are empty while the inbound request provides the header.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• QuantumNous/new-api#3066: Both PRs modify relay/channel/aws/relay-aws.go/doAwsClientRequest and its tests around anthropic-beta runtime header override handling (one ensuring it's applied; the other ensuring it's removed when the override deletes it).
• QuantumNous/new-api#2226: Both PRs address handling of anthropic_beta so it's not sent when not intended—main PR deletes the anthropic-beta header under runtime header overrides (and tests the payload), while retrieved PR makes AwsClaudeRequest.AnthropicBeta JSON-optional/conditionally set in dto.go.

Suggested reviewers

• seefs001

Poem

🐰 A header vanishes with care,
When override decrees it bare,
The beta tag will disappear,
Tests confirm the path is clear! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: removing the anthropic-beta header when runtime header overrides delete it for AWS Bedrock relay requests.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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