title: Adding custom Response Body encoding serverless yaml
body: <p>I have yaml for my APIs deployment using serverless, everything is running nice and fine, There is requirements about response body encoding in "text/html; charset=utf-8", </p>
  
  <pre><code>events:
  - http:
      path: test/test2
      method: post
      private: false
      integration: lambda
      request:
        template:
          application/x-www-form-urlencoded: '#set($inputRoot = $input.path("$")) '
      response:
        statusCodes:            
          200:
            pattern: ''
            headers:
              charset: "'utf-8'"
  </code></pre>
  
  <p>what i need to achieve is showed in below image (its actually aws APIGATEWAY - Method Response Image)</p>
  
  <p><a href="https://imgur.com/a/xDHxv" rel="nofollow noreferrer">https://imgur.com/a/xDHxv</a></p>
  
  <p>Gone through server-less Documentation, but haven't found anything useful, 
  any hint ??</p>
  
  <p>Thanks</p>