tags:

views:

28

answers:

1
Q: 

Can I detect image request by HTTP headers?

Well, I would like to know by HTTP headers if request is triggered by <img tag or by something else.

I assume that when request is called from <img tag, I'll not have */* variable in HTTP_ACCEPT or I'm missing something.

Regards

EDIT: I've tried with few browser but i can't conclude nothing by HTTP_ACCEPT...

A: 

No, sorry - a browser request made for an img tag will be identical to any other GET request - though as you point out, Firefox does give an Accept header specifying that it expects some kind of image but unless all browsers do this it's not very useful.

What's this for? There might be another way to do what you want.

Nick  2010-10-31 12:56:48
well... not right... for image (at least for FF) is:image/png,image/*;q=0.8,*/*;q=0.5
confiq  2010-10-31 13:02:11
So it does. I only actually checked Chrome and didn't think Firefox would bother. I'll update my answer a bit.
Nick  2010-10-31 13:05:17
@confiq: That's not very reliable.
You  2010-10-31 13:05:59
i need to detect in PHP request if it's image or not. It would be elegant solution using HTTP_ACCEPT...
confiq  2010-10-31 13:53:51

related questions

can i use "http header" to check if a dynamic page has been changed.
What should the HTTP response be when the resource is forbidden but there's an alternate resource?
How to detect when a user has successfully finished downloading a file in php
Interesting UTF-8 Yahoo File Download Headers
Access HTTP response headers in for flash.net.URLLoader object?
A way to prevent a mobile browser from downloading and displaying images
PHP - Custom error handling. Redirected 404 is being hijacked by AVG Anti-Virus. How to stop?
Where can I find a List of Standard HTTP Header Values?
Why is Apache + Rails is spitting out two status headers for code 500?
Why do I get "Cannot redirect after HTTP headers have been sent" when I call Response.Redirect(url)?
Possible to detect the *type of mobile device* via javascript or HTTP Headers?
Set up an HTTP proxy to insert a header
File name corruption on file download (IE)
How do I know WHEN to close an HTTP 1.1 Keep-Alive Connection?
How can I perform a HEAD request with the mechanize library?
How do I find the mime-type of a file with php?
HttpHeaders in ASP.NET 1.1
C# Get http:/.../File Size
Client-side detection of HTTP request method
How do you send a HEAD HTTP request in Python?
Specific Client Detection based on headers. Firefox extension?
How to encode the filename parameter of Content-Disposition header in HTTP?
How to set an HTTP header while using a Flex RemoteObject method ?
Making sure a web page is not cached, across all browsers.
IE6 and Caching