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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="color-scheme" content="light dark">
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<body>
<title>libhttpserver v2 — class & filesystem map</title>
<style>
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.sec-head { display: flex; align-items: baseline; gap: 12px; margin: 0 0 4px; }
.sec-head h2 { font-size: 19px; margin: 0; letter-spacing: -.01em; font-weight: 640; }
.sec-num { font-family: var(--mono); font-size: 12px; color: var(--text-faint); font-weight: 600; }
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font-weight: 700; padding: 1.5px 5px; border-radius: 4px; margin-left: 7px;
color: var(--role, var(--domain)); background: color-mix(in srgb, var(--role, var(--domain)) 13%, transparent); }
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@media (prefers-reduced-motion: reduce) { .card { transition: none; } }
</style>
<div class="wrap">
<header class="top">
<p class="kicker">libhttpserver v2.0 · architecture reference</p>
<h1>Classes, relationships & filesystem — <span class="mono">webserver</span> and its collaborators</h1>
<p class="lede">Post-<b>DR-014</b>: <span class="mono">webserver</span> is a thin façade over <span class="mono">webserver_impl</span>, which is a <b>pure composition root</b> holding <b>5 state collaborators</b> (own mutex + data) and <b>7 behavior services</b> (stateless, constructor-injected by <span class="mono">const&</span>), plus a <b>static MHD adapter facet</b>. Colour encodes the role; every card carries its header and translation units. <span class="mono" style="color:var(--text-faint)">Paths are relative to <b style="color:var(--text-dim)">src/</b>.</span></p>
<div class="legend" aria-label="legend">
<div class="grp">
<span class="lg"><span class="sw" style="background:var(--spine)"></span>composition root</span>
<span class="lg"><span class="sw" style="background:var(--state)"></span>state collaborator</span>
<span class="lg"><span class="sw" style="background:var(--behavior)"></span>behavior service</span>
<span class="lg"><span class="sw" style="background:var(--adapter)"></span>MHD adapter facet</span>
<span class="lg"><span class="sw" style="background:var(--domain)"></span>domain / value type</span>
</div>
<div class="sep" aria-hidden="true"></div>
<div class="grp">
<span class="lg"><span class="gl">◆</span>owns (value / unique_ptr)</span>
<span class="lg"><span class="gl">▸</span>holds ref (injected)</span>
<span class="lg"><span class="gl">↳</span>inherits</span>
<span class="lg"><span class="gl">⌁</span>shared/weak ptr</span>
</div>
</div>
</header>
<!-- ============ 1. COMPOSITION BACKBONE ============ -->
<section>
<div class="sec-head"><span class="sec-num">01</span><h2>Composition backbone</h2></div>
<p class="sec-sub">Ownership is strictly linear: <code>create_webserver</code> builds a <code>webserver</code>, which owns one <code>webserver_impl</code> (<code>unique_ptr</code>), which holds all twelve collaborators <b>by value</b>. Services below reference the state collaborators and each other by <code>const&</code>; construction order (state → leaf services → dispatcher → pipeline) is deliberate and enforced by <code>-Wreorder</code>. Every service also holds <code>const webserver_config&</code> (reached via <code>parent->config</code>) — shown as a dashed <span class="mono">cfg</span> chip.</p>
<div class="facade">
<span class="fc"><b>create_webserver</b> <span class="flow">──build──▸</span> <b>webserver</b></span>
<span class="fc" style="color:var(--text-faint)">·</span>
<span class="fc"><b>webserver</b> <span class="flow">◆ owns ▸</span> <b>webserver_impl</b> <span style="color:var(--text-faint)">(unique_ptr)</span> · <span class="flow">◆</span> webserver_config <span style="color:var(--text-faint)">(value)</span></span>
</div>
<div class="region">
<span class="region-tag">webserver_impl <small>composition root + MHD adapter · httpserver/detail/webserver_impl.hpp</small></span>
<div style="margin-top:14px">
<div class="subgrp-label"><span class="dot" style="background:var(--state)"></span>State collaborators <span class="meta">— each owns its own mutex(es) + data; no lock nests with another</span></div>
<div class="grid">
<div class="card r-state">
<div class="cname">daemon_lifecycle</div>
<p class="desc">MHD_Daemon handle, start/stop threading (RAII pthread), option-array + start-flag builders.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">daemon_lifecycle.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">daemon_lifecycle.cpp</span></span></span></div>
<div class="rels"><span class="chip"><span class="g">▸back</span>webserver_impl*</span></div>
</div>
<div class="card r-state">
<div class="cname">route_table</div>
<p class="desc">3-tier route store (exact map · radix trie · regex) + LRU cache, behind <span class="mono" style="font-size:10px">route_table_mutex_</span>.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">route_table.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">route_table.cpp</span></span></span></div>
<div class="rels"><span class="chip owns"><span class="g">◆</span>route_entry</span><span class="chip owns"><span class="g">◆</span>segment_trie</span><span class="chip owns"><span class="g">◆</span>route_cache</span></div>
</div>
<div class="card r-state">
<div class="cname">hook_bus</div>
<p class="desc">Eleven server-wide phase vectors + alias slots, behind one registration mutex.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">hook_bus.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">hook_bus.cpp</span></span></span></div>
</div>
<div class="card r-state">
<div class="cname">ip_access_control</div>
<p class="desc">Deny/allow IP sets + their mutexes; <span class="mono" style="font-size:10px">classify()</span> for the accept policy.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">ip_access_control.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">ip_access_control.cpp</span></span></span></div>
<div class="rels"><span class="chip owns"><span class="g">◆</span>ip_representation set</span></div>
</div>
<div class="card r-state">
<div class="cname">ws_registry <span class="tag">HAVE_WEBSOCKET</span></div>
<p class="desc">URL → handler map + mutex; hands out shared_ptr copies that survive mid-upgrade unregister.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">ws_registry.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">ws_registry.cpp</span></span></span></div>
<div class="rels"><span class="chip"><span class="g">⌁</span>websocket_handler</span></div>
</div>
</div>
</div>
<div style="margin-top:22px">
<div class="subgrp-label"><span class="dot" style="background:var(--behavior)"></span>Behavior services <span class="meta">— stateless; hold only const& to state + each other; form a DAG, no back-pointer</span></div>
<div class="grid">
<div class="card r-beh">
<div class="cname">error_pages <span class="tag">leaf</span></div>
<p class="desc">Synthesises 404 / 405 / 500 responses. Reads only the config bag + <span class="mono" style="font-size:10px">cc->request</span>.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">error_pages.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">error_pages.cpp</span></span></span></div>
<div class="rels"><span class="chip cfg">cfg</span></div>
</div>
<div class="card r-beh">
<div class="cname">hook_dispatcher</div>
<p class="desc">Dispatch-time firing: the eleven <span class="mono" style="font-size:10px">fire_*</span> phases + four gated helpers.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">hook_dispatcher.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">hook_dispatcher.cpp</span></span></span></div>
<div class="rels"><span class="chip ref-state"><span class="g">▸</span>hook_bus</span><span class="chip cfg">cfg</span></div>
</div>
<div class="card r-beh">
<div class="cname">response_materializer</div>
<p class="desc">http_response → MHD_Response: materialize, decorate, kind-dispatched queue, response_sent + fallback chain.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">response_materializer.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">response_materializer.cpp</span></span></span></div>
<div class="rels"><span class="chip ref-beh"><span class="g">▸</span>error_pages</span><span class="chip ref-beh"><span class="g">▸</span>hook_dispatcher</span><span class="chip cfg">cfg</span></div>
</div>
<div class="card r-beh">
<div class="cname">upload_pipeline</div>
<p class="desc">Multipart / file-upload: post-iterator handling, upload streams, form args.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">upload_pipeline.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">upload_pipeline.cpp</span></span></span></div>
<div class="rels"><span class="chip cfg">cfg</span></div>
</div>
<div class="card r-beh">
<div class="cname">websocket_upgrader <span class="tag">HAVE_WEBSOCKET</span></div>
<p class="desc">RFC-6455 handshake + per-connection frame receive loop.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">websocket_upgrader.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">websocket_upgrader.cpp</span></span></span></div>
<div class="rels"><span class="chip ref-state"><span class="g">▸</span>ws_registry</span></div>
</div>
<div class="card r-beh">
<div class="cname">request_dispatcher</div>
<p class="desc">Routing + auth + handler invocation: finalize_answer / resolve_resource / dispatch_resource_handler.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">request_dispatcher.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">request_dispatcher.cpp</span></span></span></div>
<div class="rels"><span class="chip ref-state"><span class="g">▸</span>route_table</span><span class="chip ref-beh"><span class="g">▸</span>hook_dispatcher</span><span class="chip ref-beh"><span class="g">▸</span>error_pages</span><span class="chip ref-beh"><span class="g">▸</span>response_materializer</span><span class="chip ref-beh"><span class="g">▸</span>ws_upgrader</span><span class="chip cfg">cfg</span></div>
</div>
<div class="card r-beh">
<div class="cname">request_pipeline</div>
<p class="desc">MHD re-entrant body-accumulation state machine: first_step / second_step / complete_request.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">request_pipeline.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">request_pipeline.cpp</span></span></span></div>
<div class="rels"><span class="chip ref-beh"><span class="g">▸</span>hook_dispatcher</span><span class="chip ref-beh"><span class="g">▸</span>request_dispatcher</span><span class="chip cfg">cfg</span></div>
</div>
</div>
</div>
<div class="facet">
<h3>▪ MHD adapter facet — static C-ABI trampolines on webserver_impl (not an 8th service)</h3>
<p>libmicrohttpd calls these by <b>function-pointer address</b>. Each casts <code>cls → webserver → impl_</code>, marshals the C ABI (sockaddr → peer_address, <code>con_cls</code>/<code>socket_context</code> lifetime), and delegates all behavior to a service. They must live on the impl to reach every collaborator — the trampoline <em>is</em> the adapter.</p>
<div class="tramps">
<span class="chip">answer_to_connection <span class="g">▸pipeline_</span></span>
<span class="chip">connection_notify <span class="g">▸hooks_dispatch_</span></span>
<span class="chip">policy_callback <span class="g">▸acl_</span></span>
<span class="chip">request_completed <span class="g">▸hooks_dispatch_</span></span>
<span class="chip">post_iterator <span class="g">▸upload_</span></span>
<span class="chip">uri_log</span>
<span class="chip">error_log</span>
<span class="chip">unescaper_func</span>
<span class="chip">psk / sni_cert <span class="g">GnuTLS</span></span>
</div>
<p class="tu">All trampolines live in one adapter TU: detail/webserver_callbacks.cpp</p>
</div>
</div>
<div style="margin-top:26px">
<div class="subgrp-label"><span class="dot" style="background:var(--spine)"></span>Translation-unit map <span class="meta">— <b>one-class-per-file shape</b>: <b>webserver</b> = a single façade TU (webserver.cpp, <b style="color:var(--behavior)">552 SLOC</b>); <b>webserver_impl</b> = 2 TUs (composition root + MHD adapter, 108 + 381 SLOC). Both webserver.cpp and webserver_callbacks.cpp sit under the <b style="color:var(--adapter)">600-SLOC façade/adapter carve-out</b> (other files: 500) — <b style="color:var(--behavior)">check-file-size gate PASSES</b>. No file spans both classes. Headers: <span class="mono">webserver.hpp</span> (+ fragments <span class="mono">webserver_routes / runtime / websocket / hooks.hpp</span>) · <span class="mono">detail/webserver_impl.hpp</span> (+ <span class="mono">webserver_impl_dispatch.hpp</span>)</span></div>
<div class="rows">
<div class="row r-spine"><div class="rn">webserver.cpp <span class="ext" style="color:var(--spine)">webserver — entire public API</span></div><div class="rf">ctor/dtor · features · lifecycle (start/stop/run/quiesce/get_fdset · allow/deny/remove_ip) · register/unregister_* · on_*/route · register/unregister_ws_resource · add_hook · install_* v1 alias hooks (auth/404/405/log_access) · stop_and_wait <b style="color:var(--behavior)">552 SLOC — within the 600 façade carve-out ✓</b></div></div>
<div class="row r-spine"><div class="rn">detail/webserver_impl.cpp <span class="ext" style="color:var(--spine)">webserver_impl · composition root</span></div><div class="rf">webserver_impl ctor/dtor — collaborator + service wiring (the DR-014 DAG) · serialize_allow_methods · prepare_or_create_lambda_shim / commit_handlers_to_shim (on_*/route shim glue)</div></div>
<div class="row r-adapter"><div class="rn">detail/webserver_callbacks.cpp <span class="ext" style="color:var(--adapter)">webserver_impl · MHD adapter</span></div><div class="rf">all C-ABI trampolines — answer_to_connection · connection_notify · policy_callback · request_completed · post_iterator · uri_log · error_log · unescaper_func · psk / sni_cert (GnuTLS) + resolve_method_callback · should_skip_auth · normalize_path · peer_address adapter <span style="color:var(--text-faint)">(381 SLOC)</span></div></div>
<div class="row r-domain"><div class="rn">detail/webserver_body_pipeline.cpp <span class="ext" style="color:var(--text-faint)">free fns</span></div><div class="rf">debug_dump_request_body_opted_in · maybe_warn_debug_dump_request_body</div></div>
<div class="row r-domain"><div class="rn">detail/dispatch_util.cpp <span class="ext" style="color:var(--text-faint)">free fns</span></div><div class="rf">detail::log_dispatch_error(const webserver_config&, string_view) — hpp: httpserver/detail/dispatch_util.hpp</div></div>
<div class="row r-domain"><div class="rn">string_utilities.cpp <span class="ext" style="color:var(--text-faint)">free fns</span></div><div class="rf">is_valid_hex · hex_char_to_val · … — hpp: httpserver/string_utilities.hpp</div></div>
</div>
</div>
</section>
<!-- ============ 2. DOMAIN LAYER ============ -->
<section>
<div class="sec-head"><span class="sec-num">02</span><h2>Request · response · resource layer</h2></div>
<p class="sec-sub">The per-request objects the services operate on. <code>connection_context</code> is the dispatch-state blackboard threaded through the pipeline via MHD's <code>con_cls</code> (allocated in <code>uri_log</code>, freed in <code>request_completed</code>); the arena that backs each <code>http_request</code> lives on <code>connection_state</code> (MHD's <code>socket_context</code>, one per keep-alive connection).</p>
<div class="grid">
<div class="card r-domain">
<div class="cname">http_request</div>
<p class="desc">Per-request inputs, PIMPL over an arena-allocated impl (custom deleter).</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/<span class="hl">http_request.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p"><span class="hl">http_request.cpp</span> · <span class="hl">http_request_auth.cpp</span></span></span></div>
<div class="rels"><span class="chip owns"><span class="g">◆</span>http_request_impl</span></div>
</div>
<div class="card r-domain">
<div class="cname">http_request_impl <span class="tag">PIMPL</span></div>
<p class="desc">~40 members, 5 concerns, one arena-allocated unit (not decomposed — see §4.2).</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">http_request_impl.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">http_request_impl.cpp</span> · <span class="hl">…_args.cpp</span> · <span class="hl">…_tls.cpp</span></span></span></div>
<div class="rels"><span class="chip owns"><span class="g">◆</span>file_info</span><span class="chip owns"><span class="g">◆</span>cookie</span></div>
</div>
<div class="card r-domain">
<div class="cname">http_response <span class="tag">final</span></div>
<p class="desc">Sealed value type; owns one polymorphic body in a 64-byte SBO buffer. Built only via factories.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/<span class="hl">http_response.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p"><span class="hl">http_response.cpp</span> · <span class="hl">http_response_factories.cpp</span></span></span></div>
<div class="rels"><span class="chip owns"><span class="g">◆</span>response_body (SBO)</span><span class="chip owns"><span class="g">◆</span>cookie</span></div>
</div>
<div class="card r-domain">
<div class="cname">http_resource</div>
<p class="desc">User-subclassable handler base; lazy per-resource hook table + allowed-method cache.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/<span class="hl">http_resource.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p"><span class="hl">http_resource.cpp</span></span></span></div>
<div class="rels"><span class="chip"><span class="g">⌁</span>resource_hook_table</span><span class="chip"><span class="g">◆</span>method_set</span></div>
</div>
<div class="card r-domain">
<div class="cname">lambda_resource <span class="tag">final</span></div>
<p class="desc">↳ http_resource. Header-only shim backing on_*/route lambda registration.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">lambda_resource.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p" style="color:var(--text-faint)">— (inline)</span></span></div>
<div class="rels"><span class="chip"><span class="g">↳</span>http_resource</span></div>
</div>
<div class="card r-domain">
<div class="cname">connection_context <span class="tag">struct</span></div>
<p class="desc">Per-request dispatch blackboard (con_cls). Carries request, response, resolved handler + ptr-to-member callback, upload stream, post-processor.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">connection_context.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p" style="color:var(--text-faint)">— (header-only)</span></span></div>
<div class="rels"><span class="chip owns"><span class="g">◆</span>http_request</span><span class="chip owns"><span class="g">◆</span>http_response?</span><span class="chip"><span class="g">⌁</span>http_resource</span><span class="chip"><span class="g">▸</span>webserver*</span></div>
</div>
<div class="card r-domain">
<div class="cname">connection_state <span class="tag">struct</span></div>
<p class="desc">Per-MHD-connection PMR arena + byte buffer; reset (release + secure-zero) between keep-alive requests.</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">connection_state.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p" style="color:var(--text-faint)">— (inline)</span></span></div>
</div>
<div class="card r-domain">
<div class="cname">http_endpoint</div>
<p class="desc">Parsed registration path (segments, params, compiled regex).</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">http_endpoint.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">http_endpoint.cpp</span></span></span></div>
</div>
<div class="card r-domain">
<div class="cname">file_info</div>
<p class="desc">Uploaded-file descriptor (size, path, content-type).</p>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/<span class="hl">file_info.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p"><span class="hl">file_info.cpp</span></span></span></div>
</div>
</div>
</section>
<!-- ============ 3. BODY HIERARCHY ============ -->
<section>
<div class="sec-head"><span class="sec-num">03</span><h2>Response body hierarchy</h2></div>
<p class="sec-sub">The only real inheritance tree in the library. <code>http_response</code> owns exactly one <code>response_body</code> subclass, stored inline in its SBO buffer (each concrete body is ≤ 64 bytes, noexcept-move via <code>move_into</code>). All declared in one header, defined in one TU.</p>
<div class="tree r-domain">
<div class="root">response_body <span class="tag">abstract</span></div>
<div class="files"><span class="f"><span class="k">hpp</span><span class="p">httpserver/detail/<span class="hl">body.hpp</span></span></span><span class="f"><span class="k">cpp</span><span class="p">detail/<span class="hl">body.cpp</span></span></span></div>
<div class="kids">
<div class="leaf"><span class="ln">empty_response_body</span><span class="lh">int flags</span></div>
<div class="leaf"><span class="ln">string_response_body</span><span class="lh">std::string</span></div>
<div class="leaf"><span class="ln">file_response_body</span><span class="lh">path / fd / size</span></div>
<div class="leaf"><span class="ln">iovec_response_body</span><span class="lh">vector<iovec_entry></span></div>
<div class="leaf"><span class="ln">pipe_response_body</span><span class="lh">fd</span></div>
<div class="leaf"><span class="ln">deferred_response_body</span><span class="lh">producer fn + trampoline</span></div>
<div class="leaf"><span class="ln">digest_challenge_response_body</span><span class="lh">unique_ptr<params></span></div>
</div>
</div>
</section>
<!-- ============ 4. ROUTE INTERNALS ============ -->
<section>
<div class="sec-head"><span class="sec-num">04</span><h2>Route-table internals</h2></div>
<p class="sec-sub">Value types owned by <code>route_table</code> — the three tiers plus the LRU cache. Mostly header-only templates and PODs.</p>
<div class="rows">
<div class="row r-state"><div class="rn">route_entry <span class="ext">struct · ◆ method_set · ⌁ shared_ptr<http_resource></span></div><div class="rf"><span class="k">hpp</span> httpserver/detail/route_entry.hpp</div></div>
<div class="row r-state"><div class="rn">segment_trie<T> <span class="ext">+ node / match · header-only template</span></div><div class="rf"><span class="k">hpp</span> httpserver/detail/segment_trie.hpp</div></div>
<div class="row r-state"><div class="rn">route_cache <span class="ext">+ cache_key / cache_value · header-only</span></div><div class="rf"><span class="k">hpp</span> httpserver/detail/route_cache.hpp</div></div>
<div class="row r-state"><div class="rn">route_tier_result <span class="ext">struct + helpers</span></div><div class="rf"><span class="k">hpp</span> httpserver/detail/route_tier.hpp <span class="k">·</span> helpers in detail/route_table.cpp</div></div>
</div>
</section>
<!-- ============ 5. HOOK SYSTEM ============ -->
<section>
<div class="sec-head"><span class="sec-num">05</span><h2>Hook system</h2></div>
<p class="sec-sub"><code>hook_bus</code> (server-wide, §01) and <code>resource_hook_table</code> (per-resource) store the registered callbacks; <code>hook_dispatcher</code> fires them; <code>hook_handle</code> is the RAII receipt that removes them. Context structs are passed to user callbacks by pointer only.</p>
<div class="rows">
<div class="row r-domain"><div class="rn">hook_handle <span class="ext">move-only · ▸ webserver_impl* · ⌁ weak resource_hook_table</span></div><div class="rf"><span class="k">hpp</span> httpserver/hook_handle.hpp <span class="k">·</span> <span class="k">cpp</span> hook_handle.cpp</div></div>
<div class="row r-state"><div class="rn">resource_hook_table <span class="ext">per-resource · 5 phase vectors</span></div><div class="rf"><span class="k">hpp</span> httpserver/detail/resource_hook_table.hpp <span class="k">·</span> <span class="k">cpp</span> resource_hook_table.cpp</div></div>
<div class="row r-domain"><div class="rn">hook context structs <span class="ext">accept · request_received · body_chunk · route_resolved · before/after_handler · handler_exception · response_sent · request_completed · connection_open/close · route_descriptor</span></div><div class="rf"><span class="k">hpp</span> httpserver/hook_context.hpp</div></div>
<div class="row r-domain"><div class="rn">peer_address <span class="ext">struct POD</span></div><div class="rf"><span class="k">hpp</span> httpserver/hook_context.hpp <span class="k">·</span> <span class="k">cpp</span> peer_address.cpp</div></div>
<div class="row r-domain"><div class="rn">hook_action <span class="ext">short-circuit payload · header-only</span></div><div class="rf"><span class="k">hpp</span> httpserver/hook_action.hpp</div></div>
</div>
</section>
<!-- ============ 6. VALUE / UTILITY ============ -->
<section>
<div class="sec-head"><span class="sec-num">06</span><h2>Config, builders, value & utility types</h2></div>
<p class="sec-sub">The config bag every service reads, the fluent builders, and the standalone value/utility types.</p>
<div class="rows">
<div class="row r-spine"><div class="rn">webserver_config <span class="ext">struct · the single config bag (const& into every service)</span></div><div class="rf"><span class="k">hpp</span> httpserver/create_webserver.hpp <span class="k">·</span> <span class="k">cpp</span> create_webserver.cpp</div></div>
<div class="row r-spine"><div class="rn">create_webserver <span class="ext">fluent builder · ◆ webserver_config</span></div><div class="rf"><span class="k">hpp</span> httpserver/create_webserver.hpp <span class="k">(+ create_webserver_setters.hpp)</span> <span class="k">·</span> <span class="k">cpp</span> create_webserver.cpp</div></div>
<div class="row r-domain"><div class="rn">create_test_request <span class="ext">test-request builder</span></div><div class="rf"><span class="k">hpp</span> httpserver/create_test_request.hpp <span class="k">·</span> <span class="k">cpp</span> create_test_request.cpp</div></div>
<div class="row r-domain"><div class="rn">websocket_handler <span class="ext">abstract user base</span></div><div class="rf"><span class="k">hpp</span> httpserver/websocket_handler.hpp <span class="k">·</span> <span class="k">cpp</span> websocket_handler.cpp</div></div>
<div class="row r-domain"><div class="rn">websocket_session <span class="ext">live upgraded connection</span></div><div class="rf"><span class="k">hpp</span> httpserver/websocket_handler.hpp <span class="k">·</span> <span class="k">cpp</span> websocket_handler.cpp</div></div>
<div class="row r-domain"><div class="rn">ip_representation <span class="ext">struct · octets + mask</span></div><div class="rf"><span class="k">hpp</span> httpserver/ip_representation.hpp <span class="k">·</span> <span class="k">cpp</span> detail/ip_representation.cpp</div></div>
<div class="row r-domain"><div class="rn">cookie <span class="ext">final · RFC 6265</span></div><div class="rf"><span class="k">hpp</span> httpserver/cookie.hpp <span class="k">·</span> <span class="k">cpp</span> cookie.cpp</div></div>
<div class="row r-domain"><div class="rn">method_set <span class="ext">struct · method bitmask (value, held widely)</span></div><div class="rf"><span class="k">hpp</span> httpserver/http_method.hpp <span class="k">(inline)</span></div></div>
<div class="row r-domain"><div class="rn">http_arg_value <span class="ext">multi-value arg view · header-only</span></div><div class="rf"><span class="k">hpp</span> httpserver/http_arg_value.hpp</div></div>
<div class="row r-domain"><div class="rn">iovec_entry <span class="ext">POD {base, len}</span></div><div class="rf"><span class="k">hpp</span> httpserver/iovec_entry.hpp</div></div>
<div class="row r-domain"><div class="rn">http_utils <span class="ext">static utils + header/arg comparators</span></div><div class="rf"><span class="k">hpp</span> httpserver/http_utils.hpp <span class="k">·</span> <span class="k">cpp</span> http_utils.cpp</div></div>
<div class="row r-domain"><div class="rn">feature_unavailable <span class="ext">↳ std::runtime_error</span></div><div class="rf"><span class="k">hpp</span> httpserver/feature_unavailable.hpp</div></div>
</div>
</section>
<footer>
<p class="note"><strong>Reading the graph.</strong> Solid ownership (<span class="mono">◆</span>) flows one way and top-down: <code>webserver</code> → <code>webserver_impl</code> → collaborators (by value) → their owned value types. Behavior services never own state — they hold <span class="mono">const&</span> (<span class="mono">▸</span>) into the state collaborators and each other, wired once in the <code>webserver_impl</code> constructor, forming an acyclic DAG with <strong>no back-pointer</strong> (the sole exception is <code>daemon_lifecycle</code>, which needs <code>webserver_impl*</code> to read broad config while building the MHD option array). The static MHD trampolines are the only code that touches libmicrohttpd's C ABI. Header convention: public surface under <code>src/httpserver/</code>, internal detail headers under <code>src/httpserver/detail/</code> (never installed), implementations under <code>src/</code> and <code>src/detail/</code>.</p>
</footer>
</div>
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