system
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I am seeing this exact same problem here on a page that bridges to somewhere else… (webmail)
When I access that webmail directly, everthing works fine…
Probably, your timeout is too low, or incorrectly measured. ??? When I submit the page, it takes a while before it returns (such as when posting file uploads for attaching files, saving router settings, … ).
Another possibility would be that your HTTP handler incorrectly handles what is called ‘chuncked encoding’. This is when a server cannot serve a whole page at once (because it takes too long to process) and therefore begins to dump what it has already got. Status would be 100 Continue I, rather than 200 OK …
Also, here, this happens when POSTing data. So a thirth possiblility would be that your network handling stuff cannot handle sending and receiving data asynchronously at the same time?
edit: i have been testing a bit more and it seems as if it errors on actually receiving a response…?