restTemplate Multipart Request sends undesired headers for each part. [SWF-1732]

[spring-operator]

Siavash Arya opened SWF-1732 and commented

I'm sending a Multipart request with RestTemplate and I realized that it include 3 headers for each part:

Forexample:

Content-Disposition: form-data; name="body"
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit

My body

This causes problems on the server that I'm trying to call. For some reason the server returns 500 each time I have Content-Type and Content-Transfer-Encoding included in the parts.

For now I solved this like this:

I copied a class from  FormHttpMessageConverter and modified the private class MultipartHttpOutputMessage to ignore other headers in the writeHeaders method. private void writeHeaders() throws IOException {
if (!this.headersWritten) {
for (Map.Entry<String, List<String>> entry : this.headers.entrySet()) {
if (!entry.getKey().equals("Content-Disposition")) continue;
byte[] headerName = getBytes(entry.getKey());
for (String headerValueString : entry.getValue()) {
byte[] headerValue = getBytes(headerValueString);
this.outputStream.write(headerName);
this.outputStream.write(':');
this.outputStream.write(' ');
this.outputStream.write(headerValue);
writeNewLine(this.outputStream);
}
}
writeNewLine(this.outputStream);
this.headersWritten = true;
}
}

But there should be a better way.

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Affects: 2.1.1