In the description, it says the client needs to set `Content-Type`. However, if
content-type specified in the header via `-H` the request doesn't work. I've
got from curl man how to specify content-type with the multipart upload.
```
You can also tell curl what Content-Type to use by using 'type=', in a manner
similar to:
curl -F "[email protected];type=text/html" url.com
```
After I've changed the example with `type=` it uploaded the jar.
[ Full content available at: https://github.com/apache/flink/pull/6706 ]
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