cannot post multi-part with file

[gregkotsaftis]

Hello,

while using Postman to test an image upload to freeimage.host, it works as supposed to.
But when I use Java code, it fails. Maybe it is a bug, but i am not sure since the same code works for imgbb.com!

POSTMAN
POST: https://freeimage.host/api/1/upload/
PARAMS: key=6d207e02198a847aa98d0a2a901485a5
BODY: source=an image filename from local filesystem

JAVA
File f = new File(an image filename from local filesystem);
HttpRequest httpRequest = HttpRequest.post( "https://freeimage.host/api/1/upload/" )
.part("key", apikey)
.part("source", f.getName(), f)
.send("");

or

File f = new File(an image filename from local filesystem);
HttpRequest httpRequest = HttpRequest.post( "https://freeimage.host/api/1/upload/" )
.part("key", apikey)
.part("source", f.getName(), f);
httpRequest,code();

Java fails with HTTP response status code 403.

[gregkotsaftis]

In Java code the apikey is "6d207e02198a847aa98d0a2a901485a5".