Question

EDIT :

I am trying to send an xml file as a post request in Android.

The server accepts text/xml. I tried creating a MultipartEntity, which has a content type of multipart/form-data.

 HttpClient httpClient = new DefaultHttpClient();

    /* New Post Request */
    HttpPost postRequest = new HttpPost(url);

    byte[] data = IOUtils.toByteArray(payload);

    /* Body of the Request */
     InputStreamBody isb = new InputStreamBody(new ByteArrayInputStream(data), "uploadedFile");
    MultipartEntity multipartContent = new MultipartEntity();
    multipartContent.addPart("uploadedFile", isb);

    /* Set the Body of the Request */
    postRequest.setEntity(multipartContent);

    /* Set Authorization Header */
    postRequest.setHeader("Authorization", authHeader);
    HttpResponse response = httpClient.execute(postRequest);
    InputStream content = response.getEntity().getContent();
    return content;

However I get an error saying the content type cannot be consumed.

The server refused this request because the request entity is in a format not supported by the requested resource for the requested method (Cannot consume content type).

How do I change the content type of the request?

Edit:

Answer 1

Long story short – use another constructor for your InputStreamBody that lets you specify the mime type you wish to use. If you don’t, the parts in your multipart request will not have a Content-Type specified (see below for details). Consequently, the server does not know what type the file is, and in your case might be refusing to accept it (mine accepted them anyway, but I assume this is driven by config). If this still doesn’t work, you might have a server-side issue.

Note: Changing the Content-Type of the request itself to anything but multipart/form-data; boundary=someBoundary renders the request invalid; the server will not correctly parse the multipart parts.

Long story long – here’s my findings.

Given the following code:

byte[] data = "<someXml />".getBytes();
multipartContent.addPart("uploadedFile", new InputStreamBody(new ByteArrayInputStream(data), "text/xml", "somefile.xml"));
multipartContent.addPart("otherPart", new StringBody("bar", "text/plain", Charset.forName("UTF-8")));
multipartContent.addPart("foo", new FileBody(new File("c:\\foo.txt"), "text/plain"));

The HttpClient posts the following payload (captured w/ Wireshark):

POST /upload.php HTTP/1.1
Transfer-Encoding: chunked
Content-Type: multipart/form-data; boundary=SeXc6P2_uEGZz9jJG95v2FnK5a8ozU8KfbFYw3
Host: thehost.com
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.1-alpha2 (java 1.5)

--SeXc6P2_uEGZz9jJG95v2FnK5a8ozU8KfbFYw3
Content-Disposition: form-data; name="uploadedFile"; filename="someXml.xml"
Content-Type: text/xml
Content-Transfer-Encoding: binary

<someXml />
--SeXc6P2_uEGZz9jJG95v2FnK5a8ozU8KfbFYw3
Content-Disposition: form-data; name="otherPart"
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

yo
--SeXc6P2_uEGZz9jJG95v2FnK5a8ozU8KfbFYw3
Content-Disposition: form-data; name="foo"; filename="foo.txt"
Content-Type: text/plain
Content-Transfer-Encoding: binary

Contents of foo.txt

--SeXc6P2_uEGZz9jJG95v2FnK5a8ozU8KfbFYw3--

On the server, the following PHP script:

<?php
print_r($_FILES);
print_r($_REQUEST);

spitted out the following:

Array
(
    [uploadedFile] => Array
        (
            [name] => someXml.xml
            [type] => text/xml
            [tmp_name] => /tmp/php_uploads/phphONLo3
            [error] => 0
            [size] => 11
        )

    [foo] => Array
        (
            [name] => foo.txt
            [type] => text/plain
            [tmp_name] => /tmp/php_uploads/php58DEpA
            [error] => 0
            [size] => 21
        )

)
Array
(
    [otherPart] => yo
)