Consumer test using application/x-www-form-urlencoded content type is being serialised as JSON

[sandy-may]

Software versions

Please provide at least OS and version of pact-js

• OS: _e.g. Mac OSX 14.5
• Consumer Pact library: _e.g. Pact JS v13.1.1
• Provider Pact library: e.g. pact-jvm-provider-maven_2.11 v 3.3.8 n/a
• Node Version: v20.16.0

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
• I have set my log level to debug and attached a log file showing the complete request/response cycle
• For bonus points and virtual high fives, I have created a reproduceable git repository (see below) to illustrate the problem

Expected behaviour

The request body is passed through to the mock server respecting the Content-Type set in the request header of the Pact Interaction

Actual behaviour

It is being serialised into JSON. Log from the express mock server: { '{"grant_type":"client_credent': '' }

Steps to reproduce

How can someone else reproduce this bug?
https://github.com/J-son1/pact-url-encoded-bug
Guidance hopefully in Readme

Relevant log files

Log file with level set to debug: pact-content-type-bug.txt