yhirose
9bfd2ddf1c
Bring the READMEs and the docs pages (en and ja) in line with the current header: - Fix the client sample that does not compile, the Transfer-Encoding statement for default headers, the verifier callback comment, the thread pool spawn rule, the sanitize_filename description, and the inverted Accept-Encoding sentence. - Describe recent behaviour: TLS errors behind Read/Write failures, Host validation, Connection: close for a body without length, content_reader rules, refused CONNECT, WebSocketClient proxies, CPPHTTPLIB_INTERIM_RESPONSE_MAX_COUNT, the SSE event size limit, and the payload limit of the Stream API. - Complete the API references of WebSocket, WebSocketClient and the stream:: helpers, and the SSE reconnect rules. - Fix cookbook pages: keychain loading on every backend, received Close status, a multipart sample that trusted the client's file name, an echo sample that sent binary as text, SNI, pre-request handler scope, stop() with WebSocket handlers, and the thread pool notes. - Restore the mutex in the LLM app's Chapter 5 code.
1.6 KiB
title, order, status
| title | order | status |
|---|---|---|
| C03. Set Default Headers | 3 | draft |
When you want the same headers on every request, use set_default_headers(). Once set, they're attached automatically to every request sent from that client.
Basic usage
httplib::Client cli("https://api.example.com");
cli.set_default_headers({
{"Accept", "application/json"},
{"User-Agent", "my-app/1.0"},
});
auto res = cli.Get("/users");
Register the headers you need on every API call — like Accept or User-Agent — in one place. No need to repeat them on each request.
Send a Bearer token on every request
httplib::Client cli("https://api.example.com");
cli.set_default_headers({
{"Authorization", "Bearer " + token},
{"Accept", "application/json"},
});
auto res1 = cli.Get("/me");
auto res2 = cli.Get("/projects");
Set the auth token once, and every subsequent request carries it. Handy when you're writing an API client that hits multiple endpoints.
Note:
set_default_headers()replaces the existing default headers. Even if you only want to add one, pass the full set again.
Combine with per-request headers
You can still pass extra headers on individual requests, even with defaults set.
httplib::Headers headers = {
{"X-Request-ID", "abc-123"},
};
auto res = cli.Get("/users", headers);
Per-request headers are added on top of the defaults, and both are sent to the server. If a per-request header has the same name as a default one, only the per-request one is sent.
For details on Bearer token auth, see C06. Call an API with a Bearer token.