FileTest.exists? over HTTP

ruby-talk
1

HI

I would like to test for the existence of a file over HTTP. I have tried
various combinations of File.stat and FileTest.exists? with no results.

For example (image.jpg exists)

if FileTest.exists?("http://domain.com/image.jpg")
    puts "found file"
end

does not print found file even though the file exists

What am I doing wrong ?

Thanks in Advance

···

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2

Using FileTest.exists?() for an HTTP operation.

By default, Ruby doesn't try to make file operations transparently work over HTTP, except for the availability of the open-uri in the ruby core, which lets one use Kernel::open() to open http, https, and ftp URIs.

The easiest way, I think, to get the simple effect you are looking for is to use open-uri.

require 'open-uri'
begin
   open("http://domain.com/image.jpg"\)
rescue OpenURI::HTTPError
   # It couldn't be accessed, so do something.
end

Kirk Haines

···

On Wed, 16 Aug 2006, Neil Charlton wrote:

HI

I would like to test for the existence of a file over HTTP. I have tried
various combinations of File.stat and FileTest.exists? with no results.

For example (image.jpg exists)

if FileTest.exists?("http://domain.com/image.jpg"\)
   puts "found file"
end

does not print found file even though the file exists

What am I doing wrong ?

3

HI

I would like to test for the existence of a file over HTTP. I have tried
various combinations of File.stat and FileTest.exists? with no results.

For example (image.jpg exists)

if FileTest.exists?("http://domain.com/image.jpg"\)
    puts "found file"
end

does not print found file even though the file exists

What am I doing wrong ?

As Kirk mentioned, the only transparent url support is with open-uri. Also File.exists? does not really make sense for a url. A given url does not necessarily point to a real file. Does it exist if you get a response code of 200? What about 302? What about 404? Sure the webserver says it doesn't exist, but you do get some content back usually.

···

On Aug 15, 2006, at 2:16 PM, Neil Charlton wrote:

Thanks in Advance

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