#1112 Content type is overridden to application/json for message providers Issue created by matdodgson Software versions • OS: Ubuntu 22.04 • Consumer Pact library: Pact JS 9.18.1 • Provider Pact library: Pact JS 12.1.0 • Node Version: 18.17.0 Issue Checklist Please confirm the following: ☑︎ I have upgraded to the latest ☑︎ I have the read the FAQs in the Readme ☑︎ I have triple checked, that there are no unhandled promises in my code and have read the section on intermittent test failures Expected behaviour That I can return an XML string from a message provider and be able to verify a pact from a message consumer that is also based on an XML string. Actual behaviour The content type on the provider is overridden to application/json so the verification always fails. See here: pact-js/src/messageProviderPact.ts Line 153 in </pact-foundation/pact-js/commit/ce5973cd6864e7b85c44468553ea6f94e8e34d3f|ce5973c> Additionally, from first glance it appears that MessageProviderPact assumes that message providers only return JSON. See here: pact-js/src/messageProviderPact.ts Line 123 in </pact-foundation/pact-js/commit/ce5973cd6864e7b85c44468553ea6f94e8e34d3f|ce5973c> Steps to reproduce • Create a consumer message contract where the content is XML (ie. not JSON). • Create a message provider that returns an XML string • Verify the message contract pact-foundation/pact-js