🐛 bug: Fix Range parsing of bytes unit #3541
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WalkthroughWhitespace handling and validation in the Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant Ctx
participant RangeParser
Client->>Ctx: Send request with Range header
Ctx->>RangeParser: Parse Range header (trim spaces, check unit)
RangeParser-->>Ctx: Return parsed ranges or error
Ctx-->>Client: Respond with range or error
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Summary of Changes
Hello @gaby, 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 focuses on improving the Range header parsing functionality within the Ctx context. My aim was to make the parsing more resilient to various input formats, specifically by handling and trimming extraneous whitespace, and to enforce strict compliance with the HTTP/1.1 specification (RFC 9110) by only recognizing the 'bytes' unit. These changes lead to more predictable and robust behavior when processing content range requests.
Highlights
- Improved Range Header Parsing Robustness: The
Rangeheader parsing logic has been enhanced to be more robust against malformed inputs by consistently trimming optional whitespace from various parts of the header value, including the overall string, the unit type, and individual range specifiers. - Enforcement of 'bytes' Unit Compliance: The parser now strictly enforces that only the canonical 'bytes' unit is recognized for
Rangeheaders. Any other unit will result in a malformed range error, aligning the implementation more closely with RFC 9110 for byte range requests. - Enhanced Test Coverage for Edge Cases: New regression tests have been added to specifically cover scenarios involving whitespace in
Rangeheaders and the rejection of unrecognized range units, ensuring the new parsing behavior is correctly validated and preventing future regressions. - Updated API Documentation for Clarity: The API reference for the
Rangemethod has been updated to explicitly document that only the 'bytes' unit is recognized and that whitespace around range specifiers will be ignored, providing clearer guidance for developers using the API.
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Code Review
The pull request enhances the Range header parsing logic by enforcing the recognition of the bytes unit, trimming whitespace, and adding regression tests. The changes improve the robustness and correctness of the Range header parsing, aligning with RFC 9110. The addition of documentation and tests further enhances the quality of the code.
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #3541 +/- ##
=======================================
Coverage 90.71% 90.71%
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Files 110 110
Lines 10954 10959 +5
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+ Hits 9937 9942 +5
Misses 767 767
Partials 250 250
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Actionable comments posted: 0
♻️ Duplicate comments (2)
ctx.go (1)
1285-1288: Excellent: Strict "bytes" unit validation enhances RFC 9110 compliance.The combination of trimming whitespace around the range type and enforcing strict "bytes" unit validation properly implements RFC 9110 requirements. The early return prevents unnecessary processing of invalid range types.
This aligns with the previous review comment about the performance benefits of early return for non-"bytes" types.
ctx_test.go (1)
2845-2845: Duplicate comment: Unit validation test case already reviewed.This test case appropriately validates that non-bytes units are rejected, supporting the stricter enforcement mentioned in the PR objectives.
🧹 Nitpick comments (2)
ctx.go (1)
1273-1343: Consider optimizing multiple trim operations for performance.While the comprehensive whitespace trimming is correct and improves RFC compliance, the multiple
utils.Trimcalls could potentially be optimized. However, given that Range header parsing is not typically a high-frequency operation, the current approach prioritizes correctness and readability over micro-optimizations.If performance becomes a concern, consider:
- Pre-processing the entire range string to remove all unnecessary whitespace once
- Using a single regex-based approach for whitespace normalization
- Benchmarking to determine if optimization is warranted
docs/api/ctx.md (1)
1216-1218: Consider adding a whitespace-handling example. Illustrating the trimming behavior—e.g.,// Range: bytes= 500-700 , 700-900—would help users understand the new parsing rules.
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📒 Files selected for processing (3)
ctx.go(2 hunks)ctx_test.go(1 hunks)docs/api/ctx.md(1 hunks)
🔇 Additional comments (7)
ctx.go (5)
1279-1279: Good: Initial whitespace trimming improves header parsing robustness.Trimming whitespace from the entire Range header value at the start helps handle headers with leading/trailing spaces, which improves RFC compliance.
1289-1289: Good: Consistent whitespace handling for ranges section.Trimming whitespace from the ranges part (after the '=') ensures consistent parsing regardless of spacing around the ranges specification.
1299-1299: Good: Proper whitespace handling in range splitting.Trimming whitespace when processing comma-separated ranges ensures that spaces around commas don't interfere with individual range parsing.
1304-1304: Good: Individual range whitespace normalization.Adding whitespace trimming for each individual range specification ensures clean parsing of range boundaries.
1313-1314: Good: Granular whitespace trimming for range components.Trimming whitespace from both start and end components of each range specification provides comprehensive whitespace handling that aligns with RFC 9110's flexibility requirements.
ctx_test.go (1)
2844-2844: LGTM! Good test coverage for whitespace handling.This test case correctly verifies that Range headers with whitespace after the equals sign (
bytes= 0-1) are properly parsed and trimmed, which aligns with the RFC 9110 compliance improvements mentioned in the PR objectives.docs/api/ctx.md (1)
1216-1218: Documentation accurately updated for Range parsing. The description now correctly enforces that only the canonical"bytes"unit is recognized and that optional whitespace around range specifiers is ignored, in alignment with RFC 9110.
Summary
bytesunit and trim whitespace when parsing Range header