What I want to do is write something simple in PHP that makes an HTTP request, takes
the data received, and passes it through.
Specifically, I am hoping to retrieve just a part of a file from the web server. If I
wanted the whole file I would just do header("Location:...");
I imagine I would want to form a basic get header request, with URL, whatever else I
need, and a "Range:bytes=1000-2000" header. If I understand correctly, the (HTTP/1.1)
web server would return the document I want, just bytes 1000-2000.
Then I would take whatever is received and use a pass through function to pipe it out.
I realize it might be simpler to do a file read (assuming I'm doing this on the very
same server as the document), and then just seek to the given position and pass
through whatever I wish. As far as that option goes, I was concerned that this might
somehow be less efficient than the above scenario, which would be letting the web
server do the seeking. But maybe both options are inefficient. Or maybe they're both
reasonable!
The real goal is to be able to take a URL like this:
http://example.com/myscript.php?url=example2.org/test.bin&start=1000
and return the document from http://example2.org/test.bin to the user's browser,
starting at byte 1000.
Any pointers at all would be appreciated.
- Ken
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