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XHR content type appears to block other requests
01-02-2016, 08:47 PM
Post: #1
XHR content type appears to block other requests
        Test result: http://www.webpagetest.org/result/151229...1/details/

The 13th request http://www.mca.gov.in/MCA21/ appears to be an XHR request (XMLHttpRequest). This appears to block the other requests. Similarly request 21 is also an XHR request.

Google Chrome Developer Tool (Network View) shows the content type of these requests as XHR, but webpagetest is showing it as HTML.

Why does XHR appear to block further request? This behaviour is not observed in Developer Tools (refer attachment).

thanks
raghu
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01-06-2016, 03:21 AM
Post: #2
RE: XHR content type appears to block other requests
XHR isn't a content type, it is how the request is initiated. The content requested was HTML which is why that was the content type.

As far as not blocking further requests, the dev tools screen shots appear to show the exact same thing. Requests after MCA21/ only start after it finished. Presumably because the code that actually triggered the XHR is doing the work that causes the other requests to be created.

Same goes for the tmp.html XHR request. There are quite a few requests in the dev tools waterfall that look like they are not loaded until that XHR completes.
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