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TRUSTAbyss
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Joined: 29 Oct 2003
Posts: 3752
Location: USA, GA
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 Posted: Fri Sep 29, 2006 1:35 pm Post subject: HTTP_RANGE Problem. |
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I can't get this header to show no matter how many times I try. I want to learn
how this thing works for download resuming. Please help, I've searched all over
Google just now with no luck what so ever.
I know the syntax:
"Content-Range: Start-Finish/Full Size"
So if I'm correct, "Content-Range: 0-4096/12288", should return the first
4096 bytes from a 12288 byte file? :/
They don't really explain this in English on the "HTTP/1.1" specification. I'm
wondering if what I'm doing is correct. I'm also wondering how to get PHP to
send $_SERVER['HTTP_RANGE'], so I can disect the value of it.
Thanks for any help on this.
Last edited by TRUSTAbyss on Fri Sep 29, 2006 2:42 pm; edited 3 times in total |
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pkSML
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Joined: 29 May 2006
Posts: 952
Location: Michigan, USA
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| Posted: Fri Sep 29, 2006 2:34 pm Post subject: |
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You learn something new everyday!
I'm reading about it here: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.16.
When you're sending this header, the response header must be 206 Partial Content, not 200 OK.
Here's the example they give:
| Code: | HTTP/1.1 206 Partial content
Date: Wed, 15 Nov 1995 06:25:24 GMT
Last-Modified: Wed, 15 Nov 1995 04:58:08 GMT
Content-Range: bytes 21010-47021/47022
Content-Length: 26012
Content-Type: image/gif
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aprelium
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TRUSTAbyss
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Joined: 29 Oct 2003
Posts: 3752
Location: USA, GA
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| Posted: Fri Sep 29, 2006 2:43 pm Post subject: |
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I think I figured it out. After doing some logging from some shared
download resuming code, I was able to log the $_SERVER['HTTP_RANGE']
and I believe I know the system now.
Correct me if I'm wrong, but is this correct?
I will put this in english for others to understand the best way that I can.
Syntax: "Content-Range: Start-Stop/FromTotalSize"
46333 (45.2 KB Downloaded So Far)
198427 (We still need about 193.7 KB)
245760 (240 KB is the Total Size.)
Now I add this to the header to tell PHP that We still need 198427 bytes.
"Content-Range: 46333-198427/245760"
Note: the 46333 Bytes is the $_SERVER['HTTP_RANGE'] variable, and the
198427 Bytes is: Total subtracted from the HTTP_RANGE.
The story.
Our download starts again at "46333" bytes and we complete it at "198427"
bytes. The other part just tells you the entire size you're downloading from.
I think this is how "Download Resuming" works. |
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