Upload progress module for apache
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Apache upload progress module. Works with mod_passenger (aka mod_rails). It's MIT license.

More info here: http://drogomir.com/blog/2008/6/18/upload-progress-bar-with-mod_passenger-and-apache

Tutorials showing how to use apache upload progress module:
http://www.drogomir.com/blog/2008/7/3/tweaking-rails-app-with-jquery-part-i (using jQuery)
http://www.railsillustrated.com/screencast-file-uploads-progress-in-rails-passenger.html (tutorial with screencast using prototype)

To install and activate module:
  apxs2 -c -i -a mod_upload_progress.c

  -c -> compile
  -i -> install (copy upload_progress_module.so to apache lib folder)
  -a -> activate (add LoadModule line to httpd.conf)

To compile it on mac you may need to:
  sudo apxs -c -i -Wc,-arch -Wc,ppc7400 -Wl,-arch -Wl,ppc7400 -Wc,-arch -Wc,ppc64 -Wl,-arch -Wl,ppc64 -Wc,-arch -Wc,x86_64 -Wl,-arch -Wl,x86_64 -Wc,-arch -Wc,i386 -Wl,-arch -Wl,i386 mod_upload_progress.c

Global config:
  you can define maximum size for shared memory (default is 50kB):
  UploadProgressSharedMemorySize 1024000 # sets memory size to 1MB

  If you get "(12)Cannot allocate memory: Upload Progress cache: could not create shared memory segment Configuration Failed"
  error you should try to set memory size to smaller value.

Config for vhost (or global locations):
  <Location />
      # enable tracking uploads in /
      TrackUploads On

  <Location /progress>
      # enable upload progress reports in /progress
      ReportUploads On

- Valid progress ID
  Progress IDs are now validated: length must be within 8..128 characters,
  identifier may contain alphanumeric characters and also -_:./!{}

- JSON-P Support
  You can also request progress updates by using JSON-P, if you are uploading
  the file from a different domain or subdomain than the web server that is
  handling your original request. Adding a "callback=yourCallbackFunction"
  parameter to your request to the progress server will activate this functionality.

  For example, a request like:

  Would return the JSON-P function:
    jsonp123({ "state" : "uploading", "received" : 35587, "size" : 716595, "speed" : 35587, "started_at": 1296568823, "uuid" : "12345678" });

  The normal JSON request:

  Would return the JSON data:
    { "state" : "uploading", "received" : 35587, "size" : 716595, "speed" : 35587, "started_at": 1296568823, "uuid" : "12345678" }

- Valid JSON-P callbacks
  Callback names are now validated: length must be within 1..64 characters
  identifier may contain alphanumeric characters and also ._$