Repository Analysis

yhirose/cpp-httplib

A C++ header-only HTTP/HTTPS server and client library

5.6 Low AI signal View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of yhirose/cpp-httplib, a C++ project with 16,668 GitHub stars. SynthScan v2.0 examined 72,381 lines of code across 228 source files, recording 370 pattern matches distributed across 6 syntactic categories. The overall adjusted score of 5.6 places this repository in the Low AI signal band.

The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).

5.6
Adjusted Score
5.6
Raw Score
100%
Time Factor
2026-07-12
Last Push
16.7K
Stars
C++
Language
72.4K
Lines of Code
228
Files
370
Pattern Hits
2026-07-14
Scan Date
0.00
HC Hit Rate

What These Metrics Mean

Adjusted Score
Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score
The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor
The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits
Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate
High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files
Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

This chart maps the temporal evolution of the adjusted synthetic code score across successive scan runs. An upward trajectory indicates ongoing incorporation of AI-generated code or expanding LLM-assisted scaffolding; a stable or declining trajectory may reflect active human refactoring, code removal, or the adoption of stricter authorship policies. The dashed secondary line (right axis) independently tracks total raw pattern hit count, which can diverge from the normalised score when codebase size changes significantly between scans.

Severity Breakdown

Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.

CRITICAL 0HIGH 0MEDIUM 37LOW 333

Directory Score Breakdown

This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.

Pattern Findings

The scanner identified 370 distinct pattern matches across 6 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.

Over-Commented Block329 hits · 286 pts
SeverityFileLineSnippetContext
LOWhttplib.h1//COMMENT
LOWhttplib.h21/*COMMENT
LOWhttplib.h41#ifndef CPPHTTPLIB_CONNECTION_TIMEOUT_USECONDCOMMENT
LOWhttplib.h61#ifndef CPPHTTPLIB_CLIENT_READ_TIMEOUT_SECONDCOMMENT
LOWhttplib.h81#ifndef CPPHTTPLIB_EXPECT_100_THRESHOLDCOMMENT
LOWhttplib.h101#ifndef CPPHTTPLIB_IDLE_INTERVAL_USECONDCOMMENT
LOWhttplib.h121#ifndef CPPHTTPLIB_REDIRECT_MAX_COUNTCOMMENT
LOWhttplib.h141#ifndef CPPHTTPLIB_TCP_NODELAYCOMMENT
LOWhttplib.h161#ifndef CPPHTTPLIB_THREAD_POOL_COUNTCOMMENT
LOWhttplib.h181#define CPPHTTPLIB_SEND_FLAGS 0COMMENT
LOWhttplib.h201#define CPPHTTPLIB_WEBSOCKET_CLOSE_TIMEOUT_SECOND 5COMMENT
LOWhttplib.h221#ifndef _CRT_NONSTDC_NO_DEPRECATECOMMENT
LOWhttplib.h241COMMENT
LOWhttplib.h261COMMENT
LOWhttplib.h281#endifCOMMENT
LOWhttplib.h301#endifCOMMENT
LOWhttplib.h321#include <functional>COMMENT
LOWhttplib.h341// unless the user explicitly opts out. Not enabled on iOS/tvOS/watchOS sinceCOMMENT
LOWhttplib.h361COMMENT
LOWhttplib.h381// these are defined in wincrypt.h and it breaks compilation if BoringSSL isCOMMENT
LOWhttplib.h401#include <openssl/ssl.h>COMMENT
LOWhttplib.h421COMMENT
LOWhttplib.h441#ifdef CPPHTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAINCOMMENT
LOWhttplib.h461#define WOLFSSL_GEN_EMAIL 1COMMENT
LOWhttplib.h481#pragma comment(lib, "crypt32.lib")COMMENT
LOWhttplib.h701}COMMENT
LOWhttplib.h13821COMMENT
LOWbenchmark/crow/crow_all.h961#endifCOMMENT
LOWbenchmark/crow/crow_all.h981#include <boost/asio.hpp>COMMENT
LOWbenchmark/crow/crow_all.h1321};COMMENT
LOWbenchmark/crow/crow_all.h1401#include <string>COMMENT
LOWbenchmark/crow/crow_all.h6241#undef CROW_CALLBACK_NOTIFYCOMMENT
LOWbenchmark/crow/crow_all.h6261#undef CROW_IS_MARKCOMMENT
LOWbenchmark/crow/crow_all.h6281#endifCOMMENT
LOWbenchmark/crow/crow_all.h7381 if (base.back() != '\\' && base.back() != '/') { base += '/'; }COMMENT
LOWbenchmark/crow/crow_all.h7401 utility::sanitize_filename(filename_sanitized);COMMENT
LOWbenchmark/crow/crow_all.h8001 return string.substr(1, string.length() - 2);COMMENT
LOWbenchmark/crow/crow_all.h8421// Any middleware requires following 3 members:COMMENT
LOWbenchmark/crow/crow_all.h8701#include <memory>COMMENT
LOWbenchmark/crow/crow_all.h9581COMMENT
LOWbenchmark/crow/crow_all.h10061COMMENT
LOWbenchmark/crow/crow_all.h10461//COMMENT
LOWbenchmark/crow/crow_all.h12481 void get_found_bp(const std::vector<size_t> &bp_i,COMMENT
LOWbenchmark/crow/crow_all.h13041#include <chrono>COMMENT
LOWtest/run_issue_2431_repro.sh1#!/usr/bin/env bashCOMMENT
LOWtest/gen-certs.sh21# cert_ip_cn.pem: CN is an IPv4 literal with NO subjectAltName. An IP host mustCOMMENT
LOWtest/fuzzing/standalone_fuzz_target_runner.cpp1// Copyright 2017 Google Inc. All Rights Reserved.COMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h1// Copyright 2007, Google Inc.COMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHTCOMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h41COMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h61 clients of class B */COMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h141 // Returns true if and only if the matcher matches x; also explains theCOMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h161 // size is when the match fails, as it's redundant to say that theCOMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h641// polymorphic matcher (i.e. a matcher that can match values of moreCOMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h701 return Matcher<T>(impl);COMMENT
LOWtest/gtest/include/gtest/gtest-matchers.h901template <typename T>COMMENT
LOWtest/gtest/include/gtest/gtest-death-test.h1// Copyright 2005, Google Inc.COMMENT
LOWtest/gtest/include/gtest/gtest-death-test.h21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHTCOMMENT
LOWtest/gtest/include/gtest/gtest-death-test.h41#define GOOGLETEST_INCLUDE_GTEST_GTEST_DEATH_TEST_H_COMMENT
LOWtest/gtest/include/gtest/gtest-death-test.h61// tests. IMPORTANT: This is an internal utility. Using it may break theCOMMENT
269 more matches not shown…
Decorative Section Separators30 hits · 94 pts
SeverityFileLineSnippetContext
MEDIUMdocs-util/llm-app/test_book.sh4# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh9# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh24# ---------------------------------------------------------------------------COMMENT
MEDIUMdocs-util/llm-app/test_book.sh26# ---------------------------------------------------------------------------COMMENT
MEDIUMdocs-util/llm-app/test_book.sh40# ---------------------------------------------------------------------------COMMENT
MEDIUMdocs-util/llm-app/test_book.sh42# ---------------------------------------------------------------------------COMMENT
MEDIUMdocs-util/llm-app/test_book.sh157# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh159# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh216# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh218# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh282# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh284# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh338# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh340# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh451# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh453# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh539# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_book.sh541# =============================================================================COMMENT
MEDIUMdocs-util/llm-app/test_webui.cpp13// ─── Test framework (minimal) ────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/test_webui.cpp58// ─── Helpers ─────────────────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/test_webui.cpp262// ─── Main ────────────────────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h24// ─── Errors ──────────────────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h31// ─── Forward declarations ────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h35// ─── Element ─────────────────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h107// ─── Session ─────────────────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h163 // ─── Navigation ──────────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h187 // ─── Find elements ──────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h221 // ─── Wait ────────────────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h252 // ─── Execute script ─────────────────────────────────────COMMENT
MEDIUMdocs-util/llm-app/webdriver.h267 // ─── Page source ────────────────────────────────────────COMMENT
AI Slop Vocabulary7 hits · 21 pts
SeverityFileLineSnippetContext
MEDIUMhttplib.h13545 // Cross-host/scheme redirect - create new client with robust setupCOMMENT
MEDIUMhttplib.h13550// New method for robust redirect client creationCOMMENT
MEDIUMhttplib.h13612 // Setup client with robust configurationCOMMENT
MEDIUMhttplib.h13620// New method for robust client setup (based on basic_manual_redirect.cppCOMMENT
MEDIUMtest/gtest/include/gtest/gtest-death-test.h152// This implementation is *not* meant to be as highly tuned or robustCOMMENT
MEDIUMtest/gtest/include/gtest/gtest-death-test.h224// In practice, this can be used to test functions that utilize theCOMMENT
MEDIUM.github/workflows/test.yaml291 # Bound the whole job in case anything in the test harness hangsCOMMENT
Deep Nesting2 hits · 2 pts
SeverityFileLineSnippetContext
LOWsplit.py12CODE
LOWgenerate_module.py10CODE
TODO Padding1 hit · 2 pts
SeverityFileLineSnippetContext
LOWbenchmark/crow/crow_all.h385// TODO: implement sorting of the qs_kv array; for now ensure it's not compiledCOMMENT
Example Usage Blocks1 hit · 2 pts
SeverityFileLineSnippetContext
LOWtest/run_issue_2431_repro.sh16# Usage:COMMENT