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# httpd_custom_api behaviour (inets v9.4.2)

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Behaviour with optional callbacks to customize the inets HTTP server.

The module implementing this behaviour shall be supplied to to the servers configuration with the option customize

# Summary

## Callbacks

request_header/1

Filter and possible alter HTTP request headers before they are processed by the server.

response_default_headers()

Provide default headers for the HTTP servers responses. Note that this option may override built-in defaults.

response_header/1

Filter and possible alter HTTP response headers before they are sent to the client.

# Callbacks

# request_header/1

(since OTP 17.5.6) (optional)

    -callback request_header({Key :: string(), Value :: string()}) ->
                                {true, {Key :: string(), Value :: string()}} | false.

Filter and possible alter HTTP request headers before they are processed by the server.

# response_default_headers()

(since OTP 18.1.1) (optional)

    -callback response_default_headers() -> [{Key :: string(), Value :: string()}].

Provide default headers for the HTTP servers responses. Note that this option may override built-in defaults.

# response_header/1

(since OTP 17.5.6) (optional)

    -callback response_header({Key :: string(), Value :: string()}) ->
                                 {true, {Key :: string(), Value :: string()}} | false | {true, string()}.

Filter and possible alter HTTP response headers before they are sent to the client.