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6868### Adding a request header
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70701. In the Add custom connector dialog, open **Request headers**.
712. Select a header name from the list, or enter one manually. Claude accepts a fixed set of standard authentication and routing header names such as `authorization`, `x-api-key`, and `x-auth-token`. Header names are restricted to this allowlist for security reasons: each name is reviewed before Claude will send it to a third-party server, which prevents connector configuration from being used to send arbitrary header names. To request an addition to the allowlist, contact your Anthropic representative.
712. Select a header name from the list, or choose **Custom header** to enter a different name. The list offers standard authentication and routing header names such as `authorization`, `x-api-key`, and `x-auth-token`, which every connector can use. Anthropic reviews and approves each custom header name before Claude will send it to a third-party server, which prevents connector configuration from being used to send arbitrary header names. If you enter a header name that isn't approved, Claude rejects the save with an error. To request approval for a custom header name, contact [Claude support](https://support.claude.com/en/articles/9015913-how-to-get-support).
72723. Enter the header value exactly as your server expects to receive it.
73734. Choose whether the header is **Required**. When a required header has no stored value at connection time, the connection fails. When an optional header has no value, Claude simply omits it from the request.
74745. Repeat for any additional headers your server needs (you can add up to four), then click **Add**.