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PODoes Windows Phone delay or batch HTTP requests? Seeing 600ms request delay to a server on the same LAN
 

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  1. PODoes Windows Phone delay or batch HTTP requests? Seeing 600ms request delay to a server on the same LAN
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    <p>I am developing a Windows Phone app that communicates with a server on home LAN over wifi, and I ran into a show stopper: an average round trip time for a tiny HTTP request inside LAN is 600-800ms. </p> <p>This only happens with a standalone phone. If the phone is connected to PC running Zune the phone starts talking through Zune and the response time drops from 600ms to 20ms (!). </p> <p>I wrote a small repro program that sends HTTP request every 100ms and ran Wireshark trace. The trace shows that the server responds right away. It is the phone that delays requests and sends three to five requests at a time as a batch roughly once a second. </p> <p>More info:</p> <p>My program is using HttpWebRequest not WebClient. I tried to spawn threads for each request, no luck. This happens on WP7 release and on Mango. The same thing whether I run off my work or home Wifi. A low level implementation using socket API in Mango exhibits same behavior.</p> <p>I have seen other posts on App Hub with the same issue. Please help clarify why this is happening.</p>
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    1. COmore info: a friend of mine suggested this was some kind of throttling mechanism for frequent requests. I tried the same test with just one request. Seeing the same response range with a single request too.
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    2. COCould you provide the code you are using to setup the requests?
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      1. USMichael Donohue
    3. COThe code does not fit into a comment. It is a basic HttpWebRequest with BeginGetResponse. I pass DateTime.Now value in AsyncState to measure response time.
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