Retrieve only a certain byte range from a file using AJAX

Question

Is this possible? I'm thinking it should be as long as the server supports resume (HTTP RANGE).

The server doesn't know what you want unless you tell it to. Make your server understand that you only want a certain byte range for the response. Ajax is simply there to read the response and use it in-script. So, this isn't really a matter of Ajax. Unless you want to filter the whole response once retrieved. — user3117575
– user3117575, Commented Aug 22, 2015 at 22:48
@Jamen, yes, and I want to "tell it" using the HTTP RANGE command. How to do this is the question. — Sarke
– Sarke, Commented Aug 22, 2015 at 22:49
I think you just have to set the RANGE header with AJAX. Answer with code coming up! — Noble Mushtak
– Noble Mushtak, Commented Aug 22, 2015 at 22:50
@charlietfl Read a line from a large fixed-width file on a CDN. — Sarke
– Sarke, Commented Aug 22, 2015 at 23:08

Noble Mushtak · Accepted Answer · 2015-08-22 23:19:54Z

3

Use XMLHttpRequest.prototype.setRequestHeader() to set the RANGE request header:

//Our AJAX object:
var req = new XMLHttpRequest();
req.open([REQUEST METHOD], [REQUEST URI], true);
//Set the RANGE header here:
req.setRequestHeader("RANGE", "value-of-RANGE-header");
// [Here, set anything else you need before sending the request, like onstatechange]
//Now, send!
req.send();

edited Aug 22, 2015 at 23:19

answered Aug 22, 2015 at 22:54

Noble Mushtak

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4 Comments

Sarke Over a year ago

I get ERR_CONTENT_DECODING_FAILED in Chrome. Also, you have a capitalization error in XMLHttpRequest

Sarke Over a year ago

Nm, works with proper Content-Type response from server, thanks!

Noble Mushtak Over a year ago

Awesome! Glad I could help!

charlietfl Over a year ago

learn something new every day...didn't know this could be done

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