<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">

<erlref>
  <header>
    <copyright>
      <year>2015</year><year>2021</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at
 
          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
      limitations under the License.
    
    </legalnotice>

    <title>httpd_custom_api</title>
    <file>httpd_custom_api.xml</file>
  </header>
  <module since="OTP 17.5.6">httpd_custom_api</module>
  <modulesummary>Behaviour with optional callbacks to customize the inets HTTP server.</modulesummary>
  <description>
    <p> The module implementing this behaviour shall be supplied to to the servers
    configuration with the option <seeerl marker="httpd#prop_customize"> customize</seeerl></p>
    
  </description>  
  <funcs>
     <func>
      <name since="OTP 18.1.1">response_default_headers() -> [Header] </name>
      <fsummary>Provide default headers for the HTTP servers responses.</fsummary>
      <type>
        <v>Header = {HeaderName :: string(), HeaderValue::string()}</v>
	<d>string:to_lower/1 will be performed on the HeaderName</d>
      </type>
      <desc>
        <p>Provide default headers for the HTTP servers responses. Note that this
	option may override built-in defaults. 
	</p>
      </desc>
    </func>
    
    <func>
      <name since="OTP 17.5.6">response_header({HeaderName, HeaderValue}) ->  {true, Header} | false </name>
      <fsummary>Filter and possible alter HTTP response headers.</fsummary>
      <type>
        <v>Header = {HeaderName :: string(), HeaderValue::string()}</v>
	<d>The header name will be in lower case and should not be altered.</d>
      </type>
      <desc>
        <p> Filter and possible alter HTTP response headers before they are sent to the client.
	</p>
      </desc>
    </func>
   
    <func>
      <name since="OTP 17.5.6">request_header({HeaderName, HeaderValue}) ->   {true, Header} | false </name>
      <fsummary>Filter and possible alter HTTP request headers.</fsummary>
      <type>
	<v>Header = {HeaderName :: string(), HeaderValue::string()}</v>
	<d>The header name will be in lower case and should not be altered.</d>
	</type>
	<desc>
	  <p> Filter and possible alter HTTP request headers before they are processed by the server.
	  </p>
	</desc>
    </func>
  </funcs>
</erlref>


