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libhttpserver Examples

Every example is a standalone program built from a single .cpp. To build the suite locally:

./bootstrap && mkdir build && cd build && ../configure && make

Each binary lands in build/examples/. To verify that an example also compiles against an installed libhttpserver (the consumer view), run scripts/verify-installed-examples.sh after make install. To enforce the structural invariants on hello_world.cpp and shared_state.cpp (LOC budget, lambda-only form, mutex usage), run scripts/check-examples.sh.

Start here

  • hello_world.cpp — ten lines, no subclassing, no raw pointers. The canonical "hello world" demo and the PRD §3.4 acceptance fixture for the v2.0 lambda idiom.
  • shared_state.cpp — the canonical example of when the class form is the right shape: an http_resource subclass that shares a std::mutex- guarded counter between render_get and render_post.

HTTP basics

  • setting_headers.cpp — attach response headers fluently with with_header.
  • hello_with_get_arg.cpp — read a query-string parameter from http_request::get_arg.
  • args_processing.cpp — iterate every form/query argument.
  • custom_error.cpp — install custom not_found_handler and method_not_allowed_handler and let set_allowing restrict methods on a resource.
  • allowing_disallowing_methods.cpp — narrow a resource to a single HTTP method via the allow mask.
  • url_registration.cpp — exact paths, prefix matches, regex paths, and parametric segments (with optional per-segment regex).
  • handlers.cpp — register distinct lambdas for GET and POST on the same path; the dispatcher composes them.

Response shapes

  • minimal_file_response.cpp — stream a file from disk.
  • binary_buffer_response.cpp — return a binary buffer (e.g. a PNG).
  • iovec_response_example.cpp — gather a response body from multiple borrowed buffers without copying.
  • pipe_response_example.cpp — stream from a pipe filled by a background thread.
  • empty_response_example.cpp — bodyless responses for DELETE / HEAD.
  • minimal_deferred.cpp — deferred response: the body is produced asynchronously by a callback.
  • deferred_with_accumulator.cpp — deferred response that mutates shared state across calls.

TLS and authentication

  • minimal_https.cpp — enable TLS with PEM key/cert files.
  • minimal_https_psk.cpp — TLS with pre-shared keys.
  • basic_authentication.cpp — per-request HTTP Basic auth inside the handler.
  • centralized_authentication.cpp — server-wide auth_handler and auth_skip_paths.
  • digest_authentication.cpp — per-request HTTP Digest auth via http_request::check_digest_auth.
  • client_cert_auth.cpp — mutual TLS with X.509 client certificates. Ships as a documentation artifact; not wired into noinst_PROGRAMS.

Operations

  • daemon_info.cpp — introspect the running daemon (bound port, listen FD, active connections).
  • external_event_loop.cpp — drive EXTERNAL_SELECT from the application's loop via run_wait.
  • custom_access_log.cpp — server-wide access-log callback.
  • minimal_ip_ban.cpp — block_ip / unblock_ip under the default ACCEPT policy.
  • turbo_mode.cpp — turbo, suppressed Date header, fastopen queue, listen backlog.
  • service.cpp — the kitchen-sink reference example: CLI args, optional TLS, all render_* overrides.

Benchmarks

  • benchmark_select.cpp, benchmark_threads.cpp, benchmark_nodelay.cpp — micro-benchmarks. See test/v1_baseline/ for v1.x reference numbers.

WebSockets

  • websocket_echo.cpp — websocket_handler subclass registered via register_ws_resource with std::make_unique.

File upload

  • file_upload.cpp, file_upload_with_callback.cpp — multipart upload, GET serves the HTML form and POST processes the parts.

Creating Certificates

Self-signed certificates can be created using OpenSSL using the following steps:

$ openssl genrsa -des3 -passout pass:x -out server.pass.key 2048
$ openssl rsa -passin pass:x -in server.pass.key -out server.key
$ openssl req -new -key server.key -out server.csr
$ openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

On the last step when prompted for a challenge password it can be left empty.

Thanks to https://devcenter.heroku.com/articles/ssl-certificate-self for these instructions.