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feat(github): use ETag conditional requests to conserve rate-limit budget

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Quiet
Tech stack
github, java, redis
Domain
api, backend

Research direction

The issue names GitHub diff, prior review, and repository content reads, plus the Redis store planned for 1.0; it does not identify source files or tests. Start by locating those GitHub read request entry points and the rate limit handling tracked in #25. The work is done when cacheable reads send stored ETags, reuse cached bodies on 304 responses, and the cache has a defined bound.

Written by the indexing model from the issue text.

Description

enhancement java
Problem Statement

GitHub read requests (diffs, prior reviews, repo contents) always fetch fresh. GitHub supports conditional requests via ETag / If-None-Match, and a 304 Not Modified response does not count against the rate limit. Without this, repeated reads consume rate-limit budget unnecessarily.

Proposed Solution

Store ETags for cacheable GitHub reads and send If-None-Match; on 304, reuse the cached body. Bound the ETag/body cache; under multiple replicas it can share the Redis store introduced for 1.0. Complements rate-limit handling (#25) by reducing consumption rather than only reacting to limits.

Alternatives Considered
  • Rely on rate-limit backoff only (#25) — handles limits reactively but does not reduce consumption.
Priority

Nice to have

Code of Conduct
  • I have searched for existing issues and this is not a duplicate.
Dominant language
Java
Stars
35
Forks
7
Avg merge
9h 32m
Merged PRs (30d)
144

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