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GLOSSARY.md

H2SPEC Compliance Status

Tracks 146 h2spec HTTP/2 protocol tests, showing 145 passing and 1 failing with details on the remaining issue.

nomadlabsinc
May 2, 2026
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What this file does

Tracks 146 h2spec HTTP/2 protocol tests, showing 145 passing and 1 failing with details on the remaining issue.

When to use it

  • Auditing your HTTP/2 server's specification compliance
  • Reporting test results to stakeholders or in documentation
  • Prioritizing fixes for the last failing protocol test
  • Comparing your implementation against a known compliance baseline

Assumes this stack

h2specHTTP/2

H2SPEC Compliance Status

Current compliance: 145/146 tests passing (99.3%)

  • 145 tests passing
  • 1 test failing (5.1.1.2 - stream identifier validation)
  • Total: 145 of 146 HTTP/2 protocol requirements satisfied

✅ Completed Features

1. Starting HTTP/2

  • Sends a client connection preface

2. Streams and Multiplexing

  • Sends a PRIORITY frame on idle stream
  • Sends a WINDOW_UPDATE frame on half-closed (remote) stream
  • Sends a PRIORITY frame on half-closed (remote) stream
  • Sends a RST_STREAM frame on half-closed (remote) stream
  • Sends a PRIORITY frame on closed stream

3. Frame Definitions

3.1. DATA

  • Sends a DATA frame
  • Sends multiple DATA frames
  • Sends a DATA frame with padding

3.2. HEADERS

  • Sends a HEADERS frame
  • Sends a HEADERS frame with padding
  • Sends a HEADERS frame with priority

3.3. PRIORITY

  • Sends a PRIORITY frame with priority 1
  • Sends a PRIORITY frame with priority 256
  • Sends a PRIORITY frame with stream dependency
  • Sends a PRIORITY frame with exclusive
  • Sends a PRIORITY frame for an idle stream, then send a HEADER frame for a lower stream ID

3.4. RST_STREAM

  • Sends a RST_STREAM frame

3.5. SETTINGS

  • Sends a SETTINGS frame

3.7. PING

  • Sends a PING frame

3.8. GOAWAY

  • Sends a GOAWAY frame

3.9. WINDOW_UPDATE

  • Sends a WINDOW_UPDATE frame with stream ID 0
  • Sends a WINDOW_UPDATE frame with stream ID 1

3.10. CONTINUATION

  • Sends a CONTINUATION frame
  • Sends multiple CONTINUATION frames

4. HTTP Message Exchanges

  • Sends a GET request
  • Sends a HEAD request
  • Sends a POST request
  • Sends a POST request with trailers

5. HPACK

  • Sends a indexed header field representation
  • Sends a literal header field with incremental indexing - indexed name
  • Sends a literal header field with incremental indexing - indexed name (with Huffman coding)
  • Sends a literal header field with incremental indexing - new name
  • Sends a literal header field with incremental indexing - new name (with Huffman coding)
  • Sends a literal header field without indexing - indexed name
  • Sends a literal header field without indexing - indexed name (with Huffman coding)
  • Sends a literal header field without indexing - new name
  • Sends a literal header field without indexing - new name (huffman encoded)
  • Sends a literal header field never indexed - indexed name
  • Sends a literal header field never indexed - indexed name (huffman encoded)
  • Sends a literal header field never indexed - new name
  • Sends a literal header field never indexed - new name (huffman encoded)
  • Sends a dynamic table size update
  • Sends multiple dynamic table size update

✅ HTTP/2 Protocol Tests (All Passing)

3. Starting HTTP/2

  • Sends client connection preface
  • Sends invalid connection preface

4. HTTP Frames

  • Sends a frame with unknown type
  • Sends a frame with undefined flag
  • Sends a frame with reserved field bit
  • Sends a DATA frame with 2^14 octets in length
  • Sends a large size DATA frame that exceeds the SETTINGS_MAX_FRAME_SIZE
  • Sends a large size HEADERS frame that exceeds the SETTINGS_MAX_FRAME_SIZE
  • Sends invalid header block fragment
  • Sends a PRIORITY frame while sending the header blocks
  • Sends a HEADERS frame to another stream while sending the header blocks

5. Streams and Multiplexing

  • All stream state tests
  • Stream identifier tests
  • Stream concurrency tests
  • Stream priority and dependency tests
  • Error handling tests
  • Extension frame tests

6. Frame Definitions

  • All DATA frame validation tests
  • All HEADERS frame validation tests
  • All PRIORITY frame validation tests
  • All RST_STREAM frame validation tests
  • All SETTINGS frame validation tests
  • All PING frame validation tests
  • All GOAWAY frame validation tests
  • All WINDOW_UPDATE frame validation tests
  • All CONTINUATION frame validation tests

7. Error Codes

  • Sends a GOAWAY frame with unknown error code
  • Sends a RST_STREAM frame with unknown error code

8. HTTP Message Exchanges

  • Most HTTP request/response exchange tests
  • All header field validation tests
  • All pseudo-header field tests
  • All connection-specific header field tests
  • All request pseudo-header field tests
  • All malformed request tests
  • Server push tests

✅ HPACK Tests (All Passing)

2. Compression Process Overview

  • Sends a indexed header field representation with invalid index
  • Sends a literal header field representation with invalid index

4. Dynamic Table Management

  • Sends a dynamic table size update at the end of header block

5. Primitive Type Representations

  • Sends a Huffman-encoded string literal representation with padding longer than 7 bits
  • Sends a Huffman-encoded string literal representation padded by zero
  • Sends a Huffman-encoded string literal representation containing the EOS symbol

6. Binary Format

  • Sends a indexed header field representation with index 0
  • Sends a dynamic table size update larger than the value of SETTINGS_HEADER_TABLE_SIZE

🔧 Test Configuration

Test 5.1.1.2: Stream identifier validation failure

  • Status: Failing (1 of 146 tests)
  • Issue: Server responds with DATA frame instead of GOAWAY with PROTOCOL_ERROR when receiving stream ID numerically smaller than previous
  • Expected: GOAWAY Frame (Error Code: PROTOCOL_ERROR) + Connection closed
  • Actual: DATA Frame (length:185, flags:0x01, stream_id:5)
  • Impact: Minor protocol violation in stream ID ordering validation

✅ Protocol Compliance Summary

The HT2 server achieves 99.3% compliance with the HTTP/2 specification:

  • 145 h2spec tests pass in both CI and local environments
  • 1 test fails (5.1.1.2 - stream identifier ordering validation)
  • Total: 145 of 146 HTTP/2 protocol requirements satisfied

This represents near-complete HTTP/2 protocol compliance suitable for most production use cases.

What's inside

3 major sections: completed features, protocol tests, HPACK tests; plus test configuration and compliance summary. 146 test entries total.

Change this for your project

  • Replace 145/146 tests passing (99.3%) with your actual test counts
  • Replace Test 5.1.1.2: Stream identifier validation failure with your failing test details
  • Replace HT2 server with your server name

Where it goes

Keep it in your repository where the agent or team that needs it will read it.

Worth borrowing

  • Checklist format for tracking spec compliance per RFC section
  • Separate section for the single failing test with expected vs actual behavior

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