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51 lines
1.5 KiB
Markdown
51 lines
1.5 KiB
Markdown
---
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title: "C06. Call an API with a Bearer Token"
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order: 6
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status: "draft"
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---
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For Bearer token authentication — common in OAuth 2.0 and modern Web APIs — use `set_bearer_token_auth()`. Pass the token and cpp-httplib builds the `Authorization: Bearer <token>` header for you.
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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_bearer_token_auth("eyJhbGciOiJIUzI1NiIs...");
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auto res = cli.Get("/me");
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if (res && res->status == 200) {
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std::cout << res->body << std::endl;
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}
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```
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Set it once and every subsequent request carries the token. This is the go-to pattern for token-based APIs like GitHub, Slack, or your own OAuth service.
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## Per-request usage
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When you want the token on only one request — or need a different token per request — pass it via headers.
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```cpp
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httplib::Headers headers = {
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httplib::make_bearer_token_authentication_header(token),
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};
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auto res = cli.Get("/me", headers);
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```
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`make_bearer_token_authentication_header()` builds the `Authorization` header for you.
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## Refresh the token
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When a token expires, just call `set_bearer_token_auth()` again with the new one.
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```cpp
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if (res && res->status == 401) {
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auto new_token = refresh_token();
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cli.set_bearer_token_auth(new_token);
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res = cli.Get("/me");
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}
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```
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> **Warning:** A Bearer token is itself a credential. Always send it over HTTPS, and never hard-code it into source or config files.
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> To set multiple headers at once, see [C03. Set default headers](../c03-default-headers).
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