Intermittent "Parse Error" with a 204 response

[jonscheiding]

Describe the bug
Our API returns 204 responses for certain requests. When we execute these requests in Postman, we almost always get a "Parse Error".

Unfortunately, we don't have a URL we can share as the API is private.

Postman gives this error most of the time:

The console doesn't contain any added information.

Occasionally (maybe 1 time out of every 10), making the request with Postman will work as expected.

Copying the CURL from Postman and running it directly:

❯ curl -i --location --request POST 'https://somedomain.com/some/url' \
--header 'Content-Type: application/json; charset=UTF-8' \
--data-raw ''
HTTP/1.1 204 No Content
Date: Fri, 19 Jun 2020 16:34:57 GMT
Server: Apache
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: content-type,accept,origin
Access-Control-Allow-Methods: GET,POST,DELETE,PUT,PATCH
Access-Control-Max-Age: 86400
Connection: close
Content-Type: application/json; charset=UTF-8

❯

(I ran it quite a few times and always got the same result.)

I've tried fiddling with the headers including adding a Content-Length: 0 header and removing the Access-Control-* ones, but got the same behavior.

App information (please complete the following information):

• Native App
• Postman Version 7.26.1
• macOS Catalina 10.15.5 (I believe also reproduced on Windows)

[jonscheiding]

Figured out that this was because our server was sending content with the 204 response.