mirror of
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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.
56 lines
1.6 KiB
Markdown
56 lines
1.6 KiB
Markdown
---
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title: "C03. Set Default Headers"
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order: 3
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status: "draft"
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---
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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.
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## Basic usage
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```cpp
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httplib::Client cli("https://api.example.com");
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cli.set_default_headers({
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{"Accept", "application/json"},
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{"User-Agent", "my-app/1.0"},
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});
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auto res = cli.Get("/users");
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```
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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.
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## Send a Bearer token on every request
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```cpp
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httplib::Client cli("https://api.example.com");
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cli.set_default_headers({
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{"Authorization", "Bearer " + token},
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{"Accept", "application/json"},
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});
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auto res1 = cli.Get("/me");
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auto res2 = cli.Get("/projects");
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```
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Set the auth token once, and every subsequent request carries it. Handy when you're writing an API client that hits multiple endpoints.
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> **Note:** `set_default_headers()` **replaces** the existing default headers. Even if you only want to add one, pass the full set again.
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## Combine with per-request headers
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You can still pass extra headers on individual requests, even with defaults set.
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```cpp
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httplib::Headers headers = {
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{"X-Request-ID", "abc-123"},
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};
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auto res = cli.Get("/users", headers);
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```
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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.
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> For details on Bearer token auth, see [C06. Call an API with a Bearer token](../c06-bearer-token).
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