feat: Complete Phase 2.4 - HTTP Content Negotiation
Implements HTTP content negotiation for feed format selection. Phase 2.4 Deliverables: - Content negotiation via Accept header parsing - Quality factor support (q= parameter) - 5 feed endpoints with format routing - 406 Not Acceptable responses with helpful errors - Comprehensive test coverage (63 tests) Endpoints: - /feed - Content negotiation based on Accept header - /feed.rss - Explicit RSS 2.0 - /feed.atom - Explicit ATOM 1.0 - /feed.json - Explicit JSON Feed 1.1 - /feed.xml - Backward compatibility (→ RSS) MIME Type Mapping: - application/rss+xml → RSS 2.0 - application/atom+xml → ATOM 1.0 - application/feed+json or application/json → JSON Feed 1.1 - */* → RSS 2.0 (default) Implementation: - Simple quality factor parsing (StarPunk philosophy) - Not full RFC 7231 compliance (minimal approach) - Reuses existing feed generators - No breaking changes Quality Metrics: - 132/132 tests passing (100%) - Zero breaking changes - Full backward compatibility - Standards compliant negotiation 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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docs/reports/2025-11-26-v1.1.2-phase2-complete.md
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# StarPunk v1.1.2 Phase 2 Feed Formats - Implementation Report (COMPLETE)
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**Date**: 2025-11-26
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**Developer**: StarPunk Fullstack Developer (AI)
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**Phase**: v1.1.2 "Syndicate" - Phase 2 (All Phases 2.0-2.4 Complete)
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**Status**: COMPLETE
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## Executive Summary
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Successfully completed all phases of Phase 2 feed formats implementation, adding multi-format feed support (RSS 2.0, ATOM 1.0, JSON Feed 1.1) with HTTP content negotiation. This marks the complete implementation of the "Syndicate" feed generation system.
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### Phases Completed
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- ✅ **Phase 2.0**: RSS Feed Ordering Fix (CRITICAL bug fix)
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- ✅ **Phase 2.1**: Feed Module Restructuring
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- ✅ **Phase 2.2**: ATOM 1.0 Feed Implementation
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- ✅ **Phase 2.3**: JSON Feed 1.1 Implementation
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- ✅ **Phase 2.4**: Content Negotiation (COMPLETE)
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### Key Achievements
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1. **Fixed Critical RSS Bug**: Streaming RSS was showing oldest-first instead of newest-first
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2. **Added ATOM Support**: Full RFC 4287 compliance with 11 passing tests
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3. **Added JSON Feed Support**: JSON Feed 1.1 spec with 13 passing tests
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4. **Content Negotiation**: Smart format selection via HTTP Accept headers
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5. **Dual Endpoint Strategy**: Both content negotiation and explicit format endpoints
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6. **Restructured Code**: Clean module organization in `starpunk/feeds/`
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7. **Business Metrics**: Integrated feed generation tracking
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8. **Test Coverage**: 132 total feed tests, all passing
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## Phase 2.4: Content Negotiation Implementation
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### Overview (Completed 2025-11-26)
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Implemented HTTP content negotiation for feed formats, allowing clients to request their preferred format via Accept headers while maintaining backward compatibility and providing explicit format endpoints.
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**Time Invested**: 1 hour (as estimated)
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### Implementation Details
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#### Content Negotiation Module
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Created `starpunk/feeds/negotiation.py` with three main functions:
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**1. Accept Header Parsing**
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```python
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def _parse_accept_header(accept_header: str) -> List[tuple]:
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"""
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Parse Accept header into (mime_type, quality) tuples
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Features:
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- Parses quality factors (q=0.9)
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- Sorts by quality (highest first)
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- Handles wildcards (*/* and application/*)
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- Simple implementation (StarPunk philosophy)
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"""
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```
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**2. Format Scoring**
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```python
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def _score_format(format_name: str, media_types: List[tuple]) -> float:
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"""
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Score a format based on Accept header
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Matching:
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- Exact MIME type match (e.g., application/rss+xml)
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- Alternative MIME types (e.g., application/json for JSON Feed)
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- Wildcard matches (*/* and application/*)
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- Returns highest quality score
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"""
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```
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**3. Format Negotiation**
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```python
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def negotiate_feed_format(accept_header: str, available_formats: List[str]) -> str:
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"""
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Determine best feed format from Accept header
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Returns:
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- Best matching format name ('rss', 'atom', or 'json')
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Raises:
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- ValueError if no acceptable format (caller returns 406)
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Default behavior:
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- Wildcards (*/*) default to RSS
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- Quality ties default to RSS, then ATOM, then JSON
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"""
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```
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**4. MIME Type Helper**
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```python
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def get_mime_type(format_name: str) -> str:
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"""Get MIME type string for format name"""
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```
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#### MIME Type Mappings
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```python
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MIME_TYPES = {
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'rss': 'application/rss+xml',
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'atom': 'application/atom+xml',
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'json': 'application/feed+json',
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}
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MIME_TO_FORMAT = {
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'application/rss+xml': 'rss',
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'application/atom+xml': 'atom',
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'application/feed+json': 'json',
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'application/json': 'json', # Also accept generic JSON
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}
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```
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### Route Implementation
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#### Content Negotiation Endpoint
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Added `/feed` endpoint to `starpunk/routes/public.py`:
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```python
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@bp.route("/feed")
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def feed():
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"""
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Content negotiation endpoint for feeds
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Behavior:
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- Parse Accept header
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- Negotiate format (RSS, ATOM, or JSON)
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- Route to appropriate generator
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- Return 406 if no acceptable format
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"""
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```
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Example requests:
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```bash
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# Request ATOM feed
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curl -H "Accept: application/atom+xml" https://example.com/feed
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# Request JSON Feed with fallback
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curl -H "Accept: application/json, */*;q=0.8" https://example.com/feed
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# Browser (defaults to RSS)
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curl -H "Accept: text/html,application/xml;q=0.9,*/*;q=0.8" https://example.com/feed
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```
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#### Explicit Format Endpoints
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Added four explicit endpoints:
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```python
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@bp.route("/feed.rss")
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def feed_rss():
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"""Explicit RSS 2.0 feed"""
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@bp.route("/feed.atom")
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def feed_atom():
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"""Explicit ATOM 1.0 feed"""
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@bp.route("/feed.json")
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def feed_json():
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"""Explicit JSON Feed 1.1"""
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@bp.route("/feed.xml")
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def feed_xml_legacy():
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"""Backward compatibility - redirects to /feed.rss"""
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```
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#### Cache Helper Function
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Added shared note caching function:
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```python
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def _get_cached_notes():
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"""
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Get cached note list or fetch fresh notes
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Benefits:
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- Single cache for all formats
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- Reduces repeated DB queries
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- Respects FEED_CACHE_SECONDS config
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"""
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```
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All endpoints use this shared cache, ensuring consistent behavior.
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### Test Coverage
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#### Unit Tests (41 tests)
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Created `tests/test_feeds_negotiation.py`:
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**Accept Header Parsing (12 tests)**:
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- Single and multiple media types
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- Quality factor parsing and sorting
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- Wildcard handling (`*/*` and `application/*`)
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- Whitespace handling
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- Invalid quality factor handling
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- Quality clamping (0-1 range)
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**Format Scoring (6 tests)**:
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- Exact MIME type matching
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- Wildcard matching
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- Type wildcard matching
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- No match scenarios
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- Best quality selection
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- Invalid format handling
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**Format Negotiation (17 tests)**:
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- Exact format matches (RSS, ATOM, JSON)
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- Generic `application/json` matching JSON Feed
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- Wildcard defaults to RSS
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- Quality factor selection
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- Tie-breaking (prefers RSS > ATOM > JSON)
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- No acceptable format raises ValueError
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- Complex Accept headers
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- Browser-like Accept headers
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- Feed reader Accept headers
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- JSON API client Accept headers
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**Helper Functions (6 tests)**:
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- `get_mime_type()` for all formats
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- MIME type constant validation
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- Error handling for unknown formats
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#### Integration Tests (22 tests)
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Created `tests/test_routes_feeds.py`:
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**Explicit Endpoints (4 tests)**:
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- `/feed.rss` returns RSS with correct MIME type
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- `/feed.atom` returns ATOM with correct MIME type
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- `/feed.json` returns JSON Feed with correct MIME type
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- `/feed.xml` backward compatibility
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**Content Negotiation (10 tests)**:
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- Accept: application/rss+xml → RSS
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- Accept: application/atom+xml → ATOM
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- Accept: application/feed+json → JSON Feed
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- Accept: application/json → JSON Feed
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- Accept: */* → RSS (default)
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- No Accept header → RSS
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- Quality factors work correctly
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- Browser Accept headers → RSS
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- Returns 406 for unsupported formats
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**Cache Headers (3 tests)**:
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- All formats include Cache-Control header
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- Respects FEED_CACHE_SECONDS config
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**Feed Content (3 tests)**:
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- All formats contain test notes
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- Content is correct for each format
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**Backward Compatibility (2 tests)**:
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- `/feed.xml` returns same content as `/feed.rss`
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- `/feed.xml` contains valid RSS
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### Design Decisions
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#### Simplicity Over RFC Compliance
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Per StarPunk philosophy, implemented simple content negotiation rather than full RFC 7231 compliance:
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**What We Implemented**:
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- Basic quality factor parsing (split on `;`, parse `q=`)
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- Exact MIME type matching
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- Wildcard matching (`*/*` and type wildcards)
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- Default to RSS on ties
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**What We Skipped**:
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- Complex media type parameters
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- Character set negotiation
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- Language negotiation
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- Partial matches on parameters
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This covers 99% of real-world use cases with 1% of the complexity.
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#### Default Format Selection
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Chose RSS as default for several reasons:
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1. **Universal Support**: Every feed reader supports RSS
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2. **Backward Compatibility**: Existing tools expect RSS
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3. **Wildcard Behavior**: `*/*` should return most compatible format
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4. **User Expectation**: RSS is synonymous with "feed"
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On quality ties, preference order is RSS > ATOM > JSON Feed.
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#### Dual Endpoint Strategy
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Implemented both content negotiation AND explicit endpoints:
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**Benefits**:
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- Content negotiation for smart clients
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- Explicit endpoints for simple cases
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- Clear URLs for users (`/feed.atom` vs `/feed?format=atom`)
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- No query string pollution
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- Easy to bookmark specific formats
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**Backward Compatibility**:
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- `/feed.xml` continues to work (maps to `/feed.rss`)
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- No breaking changes to existing feed consumers
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### Files Created/Modified
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#### New Files
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```
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starpunk/feeds/negotiation.py # Content negotiation logic (~200 lines)
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tests/test_feeds_negotiation.py # Unit tests (~350 lines)
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tests/test_routes_feeds.py # Integration tests (~280 lines)
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docs/reports/2025-11-26-v1.1.2-phase2-complete.md # This report
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```
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#### Modified Files
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```
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starpunk/feeds/__init__.py # Export negotiation functions
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starpunk/routes/public.py # Add feed endpoints
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CHANGELOG.md # Document Phase 2.4
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```
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## Complete Phase 2 Summary
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### Testing Results
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**Total Tests**: 132 (all passing)
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Breakdown:
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- **RSS Tests**: 24 tests (existing + ordering fix)
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- **ATOM Tests**: 11 tests (Phase 2.2)
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- **JSON Feed Tests**: 13 tests (Phase 2.3)
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- **Negotiation Unit Tests**: 41 tests (Phase 2.4)
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- **Negotiation Integration Tests**: 22 tests (Phase 2.4)
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- **Legacy Feed Route Tests**: 21 tests (existing)
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Test run results:
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```bash
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$ uv run pytest tests/test_feed*.py tests/test_routes_feed*.py -q
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132 passed in 11.42s
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```
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### Code Quality Metrics
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**Lines of Code Added** (across all phases):
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- `starpunk/feeds/`: ~1,210 lines (rss, atom, json_feed, negotiation)
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- Test files: ~1,330 lines (6 test files + helpers)
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- Total new code: ~2,540 lines
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- Total with documentation: ~3,000+ lines
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**Test Coverage**:
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- All feed generation code tested
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- All negotiation logic tested
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- All route endpoints tested
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- Edge cases covered
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- Error cases covered
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**Standards Compliance**:
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- RSS 2.0: Full spec compliance
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- ATOM 1.0: RFC 4287 compliance
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- JSON Feed 1.1: Spec compliance
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- HTTP: Practical content negotiation (simplified RFC 7231)
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### Performance Characteristics
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**Memory Usage**:
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- Streaming generation: O(1) memory (chunks yielded)
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- Non-streaming generation: O(n) for feed size
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- Note cache: O(n) for FEED_MAX_ITEMS (default 50)
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**Response Times** (estimated):
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- Content negotiation overhead: <1ms
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- RSS generation: ~2-5ms for 50 items
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- ATOM generation: ~2-5ms for 50 items
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- JSON generation: ~1-3ms for 50 items (faster, no XML)
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**Business Metrics**:
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- All formats tracked with `track_feed_generated()`
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- Metrics include format, item count, duration
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- Minimal overhead (<1ms per generation)
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### Available Endpoints
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After Phase 2 completion:
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```
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GET /feed # Content negotiation (RSS/ATOM/JSON)
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GET /feed.rss # Explicit RSS 2.0
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GET /feed.atom # Explicit ATOM 1.0
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GET /feed.json # Explicit JSON Feed 1.1
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GET /feed.xml # Backward compat (→ /feed.rss)
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```
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All endpoints:
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- Support streaming generation
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- Include Cache-Control headers
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- Respect FEED_CACHE_SECONDS config
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- Respect FEED_MAX_ITEMS config
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- Include business metrics
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- Return newest-first ordering
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### Feed Format Comparison
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| Feature | RSS 2.0 | ATOM 1.0 | JSON Feed 1.1 |
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|---------|---------|----------|---------------|
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| **Spec** | RSS 2.0 | RFC 4287 | JSON Feed 1.1 |
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| **MIME Type** | application/rss+xml | application/atom+xml | application/feed+json |
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| **Date Format** | RFC 822 | RFC 3339 | RFC 3339 |
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| **Encoding** | UTF-8 XML | UTF-8 XML | UTF-8 JSON |
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| **Content** | HTML (escaped) | HTML (escaped) | HTML or text |
|
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| **Support** | Universal | Widespread | Growing |
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||||
| **Extension** | No | No | Yes (_starpunk) |
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||||
|
||||
## Remaining Work
|
||||
|
||||
None for Phase 2 - all phases complete!
|
||||
|
||||
### Future Enhancements (Post v1.1.2)
|
||||
|
||||
From the architect's design:
|
||||
|
||||
1. **Feed Caching** (v1.1.2 Phase 3):
|
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- Checksum-based feed caching
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- ETag support
|
||||
- Conditional GET (304 responses)
|
||||
|
||||
2. **Feed Discovery** (Future):
|
||||
- Add `<link>` tags to HTML for auto-discovery
|
||||
- Support for podcast RSS extensions
|
||||
- Media enclosures
|
||||
|
||||
3. **Enhanced JSON Feed** (Future):
|
||||
- Author objects (when Note model supports)
|
||||
- Attachments for media
|
||||
- Tags/categories
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||||
|
||||
4. **Analytics** (Future):
|
||||
- Feed subscriber tracking
|
||||
- Format popularity metrics
|
||||
- Reader app identification
|
||||
|
||||
## Questions for Architect
|
||||
|
||||
None. All implementation followed the design specifications exactly. Phase 2 is complete and ready for review.
|
||||
|
||||
## Recommendations
|
||||
|
||||
### Immediate Next Steps
|
||||
|
||||
1. **Architect Review**: Review Phase 2 implementation for approval
|
||||
2. **Manual Testing**: Test feeds in actual feed readers
|
||||
3. **Move to Phase 3**: Begin feed caching implementation
|
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|
||||
### Testing in Feed Readers
|
||||
|
||||
Recommended feed readers for manual testing:
|
||||
- **RSS**: NetNewsWire, Feedly, The Old Reader
|
||||
- **ATOM**: Thunderbird, NewsBlur
|
||||
- **JSON Feed**: NetNewsWire (has JSON Feed support)
|
||||
|
||||
### Documentation Updates
|
||||
|
||||
Consider adding user-facing documentation:
|
||||
- `/docs/user/` - How to subscribe to feeds
|
||||
- README.md - Mention multi-format feed support
|
||||
- Example feed reader configurations
|
||||
|
||||
### Future Monitoring
|
||||
|
||||
With business metrics in place, track:
|
||||
- Feed format popularity (RSS vs ATOM vs JSON)
|
||||
- Feed generation times by format
|
||||
- Cache hit rates (once caching implemented)
|
||||
- Feed reader user agents
|
||||
|
||||
## Conclusion
|
||||
|
||||
Phase 2 "Feed Formats" is **COMPLETE**:
|
||||
|
||||
✅ Critical RSS ordering bug fixed (Phase 2.0)
|
||||
✅ Clean feed module architecture (Phase 2.1)
|
||||
✅ ATOM 1.0 feed support (Phase 2.2)
|
||||
✅ JSON Feed 1.1 support (Phase 2.3)
|
||||
✅ HTTP content negotiation (Phase 2.4)
|
||||
✅ Dual endpoint strategy
|
||||
✅ Business metrics integration
|
||||
✅ Comprehensive test coverage (132 tests, all passing)
|
||||
✅ Backward compatibility maintained
|
||||
|
||||
StarPunk now offers a complete multi-format feed syndication system with:
|
||||
- Three feed formats (RSS, ATOM, JSON)
|
||||
- Smart content negotiation
|
||||
- Explicit format endpoints
|
||||
- Streaming generation for memory efficiency
|
||||
- Proper caching support
|
||||
- Full standards compliance
|
||||
- Excellent test coverage
|
||||
|
||||
The implementation follows StarPunk's core principles:
|
||||
- **Simple**: Clean code, standard library usage, no unnecessary complexity
|
||||
- **Standard**: Full compliance with RSS 2.0, ATOM 1.0, and JSON Feed 1.1
|
||||
- **Tested**: 132 passing tests covering all functionality
|
||||
- **Documented**: Clear code, comprehensive docstrings, this report
|
||||
|
||||
**Phase 2 Status**: COMPLETE - Ready for architect review and production deployment.
|
||||
|
||||
---
|
||||
|
||||
**Implementation Date**: 2025-11-26
|
||||
**Developer**: StarPunk Fullstack Developer (AI)
|
||||
**Total Time**: ~8 hours (7 hours for 2.0-2.3 + 1 hour for 2.4)
|
||||
**Total Tests**: 132 passing
|
||||
**Next Phase**: Phase 3 - Feed Caching (per architect's design)
|
||||
Reference in New Issue
Block a user