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My question might sound stupid, but I just wanted to be sure:
Say for example you have an HTML page index.html that only shows a picture called img.jpg. Now, if your server knows that a visitor will request the HTML file and then the jpg image every time:
Would it be possible for the server to send the image just after the HTML file to save time?
I know that HTTP is a synchronous protocol, so in theory it should not work, but I just wanted someone to confirm it (or not).
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HTTP Response broadly has 3 main components: Status Line. Headers. Body (Optional)
The status line is the first line in the response message. It consists of three items: The HTTP version number, showing the HTTP specification to which the server has tried to make the message comply. A status code, which is a three-digit number indicating the result of the request.
After receiving and interpreting a request message, a server responds with an HTTP response message: A Status-line. Zero or more header (General|Response|Entity) fields followed by CRLF. An empty line (i.e., a line with nothing preceding the CRLF) indicating the end of the header fields.
HTTP messages are how data is exchanged between a server and a client. There are two types of messages: requests sent by the client to trigger an action on the server, and responses, the answer from the server.
A recent post by Jacques Mattheij, referencing your very question, claims that although HTTP was designed as a synchronous protocol, the implementation was not. In practise the browser (he doesn't specify which exactly) accepts answers to requests have not been sent yet.
On the other hand, if you are looking to something less hacky, you could have a look at :
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