title: How can I send just 'application/json' as the content-type header with Karate?
body: <p>I'm trying to write my first test for a service that I have no control over. The service validates headers on incoming requests and for the content-type header it requires that the value be <code>application/json</code>, and only that value. However when I try to write a test and explicitly set the content-type header to only have this value, the header that is generated has the following value instead: <code>application/json; charset=UTF-8</code></p>
  
  <p>This additional <code>charset=UTF-8</code> value is preventing my test from passing. Is there anyway to prevent Karate from adding it?</p>