Summary

When POST'ing to the REST API endpoint "/rest/api/2/issue", Specifying fields in the data using upper case letters will cause a 500 error to be returned.

For example the following data will cause a 500 error:

Bad data

{
      "Fields": {
        "Project": {
          "ID": "10000"
        },
        "Summary": "something'\''s wrong",
        "Issuetype": {
          "ID": "10004"
        },
        "Description": "description",
        "Duedate": "2018-03-11"
      }
    }

Environment

Cloud

Steps to Reproduce

• Run a post to the "/rest/api/2/issue" endpoint with data like the one specified above

Expected Results

The POST works or provides a normal error explaining the issue.

Actual Results

A 500 error is returned with content like this:

'{"errorMessages":["Internal server error"],"errors":{}}'

Workaround

You must ensure that all field identifiers are lower case.