Utility-belt to build form data request bodies.

Add this line to your application's Gemfile:

gem 'http-form_data'

And then execute:

$ bundle

Or install it yourself as:

$ gem install http-form_data

require "http/form_data"

form = HTTP::FormData.create({
  :username     => "ixti",
  :avatar_file  => HTTP::FormData::File.new("/home/ixti/avatar.png")
})

# Assuming socket is an open socket to some HTTP server
socket << "POST /some-url HTTP/1.1\r\n"
socket << "Host: example.com\r\n"
socket << "Content-Type: #{form.content_type}\r\n"
socket << "Content-Length: #{form.content_length}\r\n"
socket << "\r\n"
socket << form.to_s

It's also possible to create a non-file part with Content-Type:

form = HTTP::FormData.create({
  :username     => HTTP::FormData::Part.new('{"a": 1}', content_type: 'application/json'),
  :avatar_file  => HTTP::FormData::File.new("/home/ixti/avatar.png")
})

This library aims to support and is tested against the following Ruby versions:

• Ruby 3.2
• Ruby 3.3
• Ruby 3.4
• Ruby 4.0

If something doesn't work on one of these versions, it's a bug.

This library may inadvertently work (or seem to work) on other Ruby versions, however support will only be provided for the versions listed above.

If you would like this library to support another Ruby version or implementation, you may volunteer to be a maintainer. Being a maintainer entails making sure all tests run and pass on that implementation. When something breaks on your implementation, you will be responsible for providing patches in a timely fashion. If critical issues for a particular implementation exist at the time of a major release, support for that Ruby version may be dropped.

1. Fork it ( https://github.com/httprb/form_data.rb/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Copyright (c) 2015-2026 Alexey V Zapparov. See LICENSE.txt for further details.