httpresponse - HTTP request and response flow for get -

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i having difficulties understanding http request , response flow. working system can "hijack" incoming http request , give own response. problem having type of request seem assume data sent in first request.

for instance, jpeg image requests, no matter size (my tests include 0-20 mb jpeg files) seems assume entire data sent in first response. if don't send data , explicitly set range header 0 never response client asking data.

other data request types, such mp4 video, client seems fine getting response header information no data , sends new request explicitly asking byte range 0-.

is there kind of agreement between the client , server types should sent in 1 request while others can split in number of requests?


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