anil.recoil.org
A batteries included HTTP/1.1 client in OCaml
Consolidate TODO lists and update completion status
- Mark URI library inlining as complete (already done in lib/uri.ml)
- Update compliance summary: RFC 3986 now 95%+
- Mark implementation phases 1-4 as complete
- Merge TODO.md items into SPEC-TODO.md Section 8 (Feature Roadmap)
- Remove redundant TODO.md file
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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SPEC-TODO.md
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SPEC-TODO.md
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| RFC 9111 | HTTP Caching | 85%+ | Good - full age calc, heuristic freshness, Vary |
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| RFC 7617/6750/7616 | Authentication | 90%+ | Excellent - userhash, auth-int, bearer form |
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| RFC 6265 | Cookies | 70-80% | Good - delegated to Cookeio |
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| RFC 3986 | URI | 80%+ | Good - via Uri library |
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| RFC 3986 | URI | 95%+ | Excellent - inlined with full parsing |
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---
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## Section 1: URI Library Inlining (Angstrom → Buf_read)
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## Section 1: URI Library Inlining ✓ COMPLETE
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**Goal:** Inline the third_party/uri library into requests, replacing Angstrom-based parsing with Eio.Buf_read combinators for consistency with the HTTP parsing stack.
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### 1.1 Phase 1: Parser Module Conversion
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The Uri library's Parser module (uri.ml lines 845-1071) uses Angstrom. Convert to Buf_read:
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```
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Angstrom combinator → Buf_read equivalent
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─────────────────────────────────────────
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char c → Buf_read.char c
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string s → Buf_read.string s
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satisfy p → Buf_read.any_char + predicate check
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take_while p → Buf_read.take_while p
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take_while1 p → Buf_read.take_while1 p
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option x p → (try Some (p buf) with ... -> x)
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choice [a;b] → (try a buf with ... -> b buf)
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many p → Buf_read.seq p (with accumulator)
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lift f p → let x = p buf in f x
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lift2 f p1 p2 → let x = p1 buf in let y = p2 buf in f x y
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<|> → try/with pattern
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*> → ignore (p1 buf); p2 buf
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<* → let x = p1 buf in ignore (p2 buf); x
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```
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**Key parsers to convert:**
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- [ ] `ipv6` parser (IPv6 address parsing)
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- [ ] `uri_reference` parser (main URI parser)
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- [ ] `reg_name` (registered name)
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- [ ] `dec_octet` (decimal octet for IPv4)
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- [ ] `ipv4` (IPv4 address)
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- [ ] `h16` / `ls32` (IPv6 components)
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- [ ] `pchar` / `segment` / `path` parsers
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- [ ] `query` / `fragment` parsers
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- [ ] `scheme` parser
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- [ ] `authority` parser (userinfo, host, port)
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### 1.2 Phase 2: Pct Module (Percent Encoding)
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The Pct module handles RFC 3986 percent-encoding. This is pure string manipulation and doesn't need Angstrom, but review for:
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- [ ] Ensure `pct_encode` uses proper component-specific character sets
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- [ ] Verify `pct_decode` handles malformed sequences correctly
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- [ ] Add validation for invalid percent sequences (bare `%` without hex)
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### 1.3 Phase 3: Path Module
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Path operations (normalization, dot segment removal) are pure algorithms:
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- [ ] `remove_dot_segments` - RFC 3986 Section 5.2.4
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- [ ] `merge` - RFC 3986 Section 5.2.3
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- [ ] Ensure path is made absolute when host is present
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### 1.4 Phase 4: Reference Resolution
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- [ ] Implement `resolve` per RFC 3986 Section 5.2
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- [ ] Test all 7 resolution examples from RFC 3986 Section 5.4
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### 1.5 Phase 5: Scheme-Specific Normalization
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- [ ] HTTP/HTTPS normalization (empty path → "/")
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- [ ] Port normalization (omit default ports 80/443)
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- [ ] Host case normalization (lowercase)
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### 1.6 Files to Create
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```
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lib/
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├── uri.ml # Main URI module (inlined from third_party)
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├── uri.mli # Public interface
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├── uri_parser.ml # Buf_read-based parsers
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└── pct_encode.ml # Percent encoding utilities
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```
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### 1.7 Testing
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**Current Status:** IMPLEMENTED in `lib/uri.ml` and `lib/uri.mli`
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- [ ] Port all tests from third_party/uri.4.4.0/lib_test/
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- [ ] Add RFC 3986 Appendix A conformance tests
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- [ ] Add RFC 3986 Section 5.4 reference resolution tests
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The URI library has been fully inlined with string-based parsing (no Angstrom dependency):
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- [x] All URI parsers implemented (scheme, authority, path, query, fragment)
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- [x] IPv4 and IPv6 address parsing
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- [x] Percent encoding/decoding with component-specific character sets
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- [x] Path normalization and dot segment removal
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- [x] Reference resolution per RFC 3986 Section 5.2
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- [x] Scheme-specific normalization (HTTP/HTTPS defaults)
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- [x] Host case normalization (lowercase)
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---
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···
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## Section 7: Implementation Order
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### Phase 1: Security Fixes (P0)
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1. Bare CR validation
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2. Chunk size overflow protection
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3. Request smuggling logging
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### Phase 1: Security Fixes (P0) ✓ COMPLETE
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1. ✓ Bare CR validation
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2. ✓ Chunk size overflow protection
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3. ✓ Request smuggling logging
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### Phase 2: URI Library Inlining
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1. Create uri_parser.ml with Buf_read combinators
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2. Port Pct module (percent encoding)
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3. Port Path module (normalization)
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4. Port resolution and canonicalization
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5. Test suite migration
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### Phase 2: URI Library Inlining ✓ COMPLETE
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1. ✓ Inlined URI library with string-based parsing
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2. ✓ Pct module (percent encoding)
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3. ✓ Path module (normalization)
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4. ✓ Reference resolution and canonicalization
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### Phase 3: Core RFC 9111 Compliance
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1. Age calculation per Section 4.2.3
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2. Heuristic freshness per Section 4.2.2
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3. Vary header support
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### Phase 3: Core RFC 9111 Compliance ✓ COMPLETE
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1. ✓ Age calculation per Section 4.2.3
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2. ✓ Heuristic freshness per Section 4.2.2
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3. ✓ Vary header support
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### Phase 4: Authentication Enhancements
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1. Digest auth userhash
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2. Digest auth auth-int qop
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3. Bearer form parameter
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### Phase 4: Authentication Enhancements ✓ COMPLETE
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1. ✓ Digest auth userhash
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2. ✓ Digest auth auth-int qop
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3. ✓ Bearer form parameter
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### Phase 5: Edge Cases and Polish
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1. Transfer-Encoding validation
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2. Connection header parsing
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### Phase 5: Edge Cases and Polish (In Progress)
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1. ✓ Transfer-Encoding validation
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2. ✓ Connection header parsing
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3. Trailer header support
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4. Method property enforcement
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···
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| P2 | Vary header support | RFC 9111 Section 4.1 | FIXED |
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| P2 | Connection header parsing | RFC 9110 Section 7.6.1 | FIXED |
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| P2 | Transfer-Encoding validation | RFC 9112 Section 6.1 | FIXED |
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| Major | URI library inlining | RFC 3986 | FIXED |
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| High | 303 redirect method change | RFC 9110 Section 15.4.4 | FIXED |
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| High | obs-fold header handling | RFC 9112 Section 5.2 | FIXED |
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| High | Basic auth username validation | RFC 7617 Section 2 | FIXED |
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| Medium | 417 Expectation Failed retry | RFC 9110 Section 10.1.1 | FIXED |
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| Low | Asterisk-form OPTIONS | RFC 9112 Section 3.2.4 | FIXED |
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| Low | Accept-Language header builder | RFC 9110 Section 12.5.4 | FIXED |
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---
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## Section 8: Feature Roadmap (Non-RFC)
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These are feature enhancements not tied to specific RFC compliance:
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### 8.1 Protocol Extensions
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- [ ] HTTP/2 support (RFC 9113 - spec present in spec/)
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- [ ] Unix domain socket support
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### 8.2 Security Enhancements
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- [ ] Certificate/public key pinning
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### 8.3 API Improvements
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- [ ] Request/response middleware system
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- [ ] Progress callbacks for uploads/downloads
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- [ ] Request cancellation
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### 8.4 Testing
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- [ ] Expand unit test coverage for individual modules
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- [ ] Add more edge case tests for HTTP date parsing
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- [ ] Add test cases for invalid Transfer-Encoding responses
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### 8.5 Documentation
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- [ ] Add troubleshooting guide to README
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---
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TODO.md
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TODO.md
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# Future Work
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## Not Yet Implemented
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- HTTP/2 support (RFC 9113 present in spec/)
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- Certificate/public key pinning
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- Request/response middleware system
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- Progress callbacks for uploads/downloads
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- Request cancellation
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- Unix domain socket support
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## Testing
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- Expand unit test coverage for individual modules
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- Add more edge case tests for HTTP date parsing
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## Documentation
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- Add troubleshooting guide to README