API Testing Challenge 24 - How To - POST JSON accept XML

How to complete the challenge `POST /todos JSON to XML` to send a POST request to create a todo item using JSON but receive XML response.

Issue a POST request on the `/todos` end point to create a todo using Content-Type `application/json` but Accept `application/xml`

- `POST` request means we will send information in the body of the message
- e.g. `POST /todos` sends to the todos endpoint
- `create a todo` means that the payload will be valid data to create a todo item
- `using Content-Type` `application/json` means that we will set `content-type` header to `application/json` and the payload will be in JSON format
- `Accept` `application/xml` means add an `accept` header of `application/xml` to receive the response in JSON format
- add the `X-CHALLENGER` header to track progress

For a write up of this solution, check out the blog post:

https://eviltester.com/apichallenges/howto/24-post-json-accept-xml

Find the API Challenges here:

https://eviltester.com/apichallenges

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