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    <p>The <code>URLConnection</code> buffers by default <em>everything</em> which is been written to its <code>getOutputStream()</code> in client's memory until it's closed. This is mandatory because the HTTP <code>Content-Length</code> response header needs to be set. But the content length is only known once all bytes have been written. This may be memory hogging when the response body is relatively large.</p> <p>If you know beforehand the exact amount of bytes (note: bytes, not characters) being written, then you could use <code>setFixedLengthStreamingMode()</code> to set it with <strong>exactly</strong> that amount of bytes, so that the <code>Content-Length</code> header could be set much sooner and so that <code>URLConnection</code> can flush more often. In your particular case, you apparently used the wrong value.</p> <p>The <code>setChunkedStreamingMode()</code> basically changes the transfer encoding to <code>chunked</code>. This is basically one line with the byte length in hexcode and then one line of written bytes therafter and then a blank line (see also <a href="http://en.wikipedia.org/wiki/Chunked_transfer_encoding" rel="nofollow noreferrer">wikipedia</a>). The last line has a byte length of 0 and so the server knows when it's the end of the body so that it doesn't have to wait for any incoming data. This allows the response body being flushed more often. You should only not set it with 0, but with a sensible value, such as 1000 or so. This way every 1000 written bytes will be sent as a new chunk.</p> <h3>See also:</h3> <ul> <li><a href="https://stackoverflow.com/questions/2793150/how-to-use-java-net-urlconnection-to-fire-and-handle-http-requests/2793153#2793153">Using java.net.URLConnection to fire and handle HTTP requests</a></li> </ul>
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    1. POHttpURLConnection: what does setFixedLengthStreamingMode() want the size of?
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    1. POHttpURLConnection: what does setFixedLengthStreamingMode() want the size of?
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    1. COYea, I eventually did figure out that what it wants is the total size of everything I'm going to write() (but not the size of any of the headers it will be generating for me, which would be hard to guess :-). I built a prefix and suffix buffer so I could ask the length of everything to pass to setFixedLengthStreamingMode() and it finally started working.
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    2. COYou're welcome.
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    3. CO@BalusC what do you mean by `buffers by default everything... in server's memory until it's closed`? By "server's memory" do you mean the phone's memory (or more specifically the App's allocated memory heap)? I ask because what if you're uploading a large image file in a multipart/form-data, will the entire image and form-data headers be buffered in heap/phone memory, possibly leading to a OOM problem? Unless you predetermine the byte length of the form-data headers and your image, and then set it using `setFixedLengthStreamingMode()`?
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