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fix: preserve JSON-like string values in header override#1052

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looplj merged 1 commit intolooplj:release/v0.9.xfrom
GhostFlying:codex/investigate-header-override-bug
Mar 13, 2026
Merged

fix: preserve JSON-like string values in header override#1052
looplj merged 1 commit intolooplj:release/v0.9.xfrom
GhostFlying:codex/investigate-header-override-bug

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@GhostFlying
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Problem

When setting header override values with JSON-like strings (e.g., {"session_id":"843634473"}), the previous implementation used fmt.Sprintf("%v", renderedValue) which incorrectly formatted the value as a Go map literal with map[ prefix (e.g., map[session_id:843634473]), corrupting the original JSON format.

Solution

  • Replace renderOverrideValue with renderTemplate to ensure proper string rendering
  • Remove fmt.Sprintf("%v", ...) formatting and pass the rendered value directly to preserve the original JSON string format

Changes

  • internal/server/orchestrator/override.go: Fixed header value assignment in applyOverrideOperationToHeaders
  • internal/server/orchestrator/override_test.go: Added TestOverrideHeadersKeepJSONLikeString to verify JSON-like strings are preserved without map[ prefix

Test Coverage

New test validates preservation of:

  • Mixed-case JSON keys (camelCase)
  • Underscore and hyphenated keys
  • Complete JSON structure without map[ prefix contamination

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Summary of Changes

Hello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical bug that caused JSON-like string values used in header overrides to be malformed. By refining the value rendering process, the change ensures that complex string structures, such as JSON, are accurately transmitted without unintended modifications, thereby improving the reliability of header manipulation.

Highlights

  • Header Override Fix: Addressed an issue where JSON-like string values in header overrides were corrupted by fmt.Sprintf("%v", ...) by incorrectly formatting them as Go map literals.
  • Rendering Logic Update: Replaced renderOverrideValue with renderTemplate and removed fmt.Sprintf("%v", ...) to ensure proper string rendering and preservation of original JSON format.
  • New Test Coverage: Introduced TestOverrideHeadersKeepJSONLikeString to validate that JSON-like strings are preserved correctly, covering mixed-case, underscore, and hyphenated keys.
Changelog
  • internal/server/orchestrator/override.go
    • Replaced renderOverrideValue with renderTemplate for rendering override values.
    • Removed fmt.Sprintf("%v", renderedValue) when setting headers to prevent incorrect formatting.
  • internal/server/orchestrator/override_test.go
    • Added TestOverrideHeadersKeepJSONLikeString to verify that JSON-like strings are preserved correctly in header overrides.
Activity
  • No human activity has been recorded on this pull request yet.
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Code Review

This pull request correctly resolves an issue where JSON-like string values in header overrides were being improperly formatted. The change to use renderTemplate instead of renderOverrideValue and removing the fmt.Sprintf call ensures that header values are treated as strings, preserving their original format. A new test case has been added that specifically validates this fix, confirming that JSON-like strings are no longer corrupted. The changes are well-implemented and effectively address the described problem.

@looplj
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looplj commented Mar 13, 2026

ci 挂了

@GhostFlying
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我修下

@GhostFlying GhostFlying force-pushed the codex/investigate-header-override-bug branch from 643f5b0 to 71e7599 Compare March 13, 2026 15:30
@looplj looplj merged commit 74ad10a into looplj:release/v0.9.x Mar 13, 2026
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2 participants