# Image file URL generated by image\_tag include some parameter

**URL:** <https://www.ruby-forum.com/t/image-file-url-generated-by-image-tag-include-some-parameter/89978>\
**Category:** Rails\
**Created:** [March 24, 2007, 3:41pm UTC](https://www.ruby-forum.com/t/image-file-url-generated-by-image-tag-include-some-parameter/89978 "2007-03-24T15:41:34Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Jung-joon\_Kim](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/ecae2f/32.png) [@Jung-joon\_Kim](https://www.ruby-forum.com/u/Jung-joon_Kim)\
**Post date:** [March 24, 2007, 3:41pm UTC](https://www.ruby-forum.com/t/image-file-url-generated-by-image-tag-include-some-parameter/89978/1 "2007-03-24T15:41:34Z")

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I’m using image\_tag to generate img tag.

URL of image file generated by image\_tag include a parameter like  
following.

“http:// … /images/filename.gif?123123123”

What’s this number parameter for? How can I remove it? I’m using rails  
with built-in WEBrick server in test mode.

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**Author:** ![Jung-joon\_Kim](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/ecae2f/32.png) [@Jung-joon\_Kim](https://www.ruby-forum.com/u/Jung-joon_Kim)\
**Post date:** [March 24, 2007, 4:18pm UTC](https://www.ruby-forum.com/t/image-file-url-generated-by-image-tag-include-some-parameter/89978/2 "2007-03-24T16:18:46Z")

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It’s a timestamp that is automatically generated by the image\_tag()  
helper. This forces browsers to download the latest image if updated.

–  
Zack C.  
[http://depixelate.com](http://depixelate.com)

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<div class="post-metadata">

**Author:** ![Jung-joon\_Kim](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/ecae2f/32.png) [@Jung-joon\_Kim](https://www.ruby-forum.com/u/Jung-joon_Kim)\
**Post date:** [March 24, 2007, 5:01pm UTC](https://www.ruby-forum.com/t/image-file-url-generated-by-image-tag-include-some-parameter/89978/3 "2007-03-24T17:01:55Z")

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Can I remove it?

Some clients with old browser complain browser can’t display images  
htmlized with image\_tag method. (But I didn’t see the situation in  
person, and not sure about a cause)

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<div class="post-metadata">

**Author:** ![Jung-joon\_Kim](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/ecae2f/32.png) [@Jung-joon\_Kim](https://www.ruby-forum.com/u/Jung-joon_Kim)\
**Post date:** [March 24, 2007, 6:20pm UTC](https://www.ruby-forum.com/t/image-file-url-generated-by-image-tag-include-some-parameter/89978/4 "2007-03-24T18:20:14Z")

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Wow - that must be a pretty old browser…

Just use an img html tag or override the image\_tag() helper.

–  
Zack C.  
[http://depixelate.com](http://depixelate.com)

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<div class="post-metadata">

**Author:** ![Jung-joon\_Kim](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/ecae2f/32.png) [@Jung-joon\_Kim](https://www.ruby-forum.com/u/Jung-joon_Kim)\
**Post date:** [March 27, 2007, 2:42am UTC](https://www.ruby-forum.com/t/image-file-url-generated-by-image-tag-include-some-parameter/89978/5 "2007-03-27T02:42:27Z")

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[http://hypsometry.com/blog/on-browser-caching-asset-timestamping-and-rails](http://hypsometry.com/blog/on-browser-caching-asset-timestamping-and-rails)

the point is … Environment varible RAILS\_ASSET\_ID changes behavior  
of rails URL processing.