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Log outgoing HTTP requests

branch: master


Gem Version Build Status Code Climate

Log outgoing HTTP requests made from your application. See the blog post for more details.

So far this gem works with the following ruby modules and libraries:

These libraries are at least partially supported, where they use one of the above as adapters:

In theory, it should also work with any library built on top of these. But since the difference between theory and practice is bigger in practice than in theory, YMMV.

This is very much a development and debugging tool; it is not recommended to use this in a production environment.


gem install httplog


require 'httplog'

By default, this will log all outgoing HTTP requests and their responses to $stdout on DEBUG level.


You can override the following default options:

HttpLog.options[:logger]        =$stdout)
HttpLog.options[:severity]      = Logger::Severity::DEBUG
HttpLog.options[:log_connect]   = true
HttpLog.options[:log_request]   = true
HttpLog.options[:log_headers]   = false
HttpLog.options[:log_data]      = true
HttpLog.options[:log_status]    = true
HttpLog.options[:log_response]  = true
HttpLog.options[:log_benchmark] = true
HttpLog.options[:compact_log]   = false # setting this to true will make all "log_*" options redundant

# only log requests made to specified hosts (URLs)
HttpLog.options[:url_whitelist_pattern] = /.*/
# overrides whitelist 
HttpLog.options[:url_blacklist_pattern] = nil 

So if you want to use this in a Rails app:

# config/initializers/httplog.rb
HttpLog.options[:logger] = Rails.logger


With the default configuration, the log output might look like this:

D, [2012-11-21T15:09:03.532970 #6857] DEBUG -- : [httplog] Connecting: localhost:80
D, [2012-11-21T15:09:03.533877 #6857] DEBUG -- : [httplog] Sending: GET http://localhost:9292/index.html
D, [2012-11-21T15:09:03.534499 #6857] DEBUG -- : [httplog] Status: 200
D, [2012-11-21T15:09:03.534544 #6857] DEBUG -- : [httplog] Benchmark: 0.00057 seconds
D, [2012-11-21T15:09:03.534578 #6857] DEBUG -- : [httplog] Response:
    <title>Test Page</title>
    <h1>This is the test page.</h1>

Known Issues

  • Requests types other than GET and POST have not been explicitly tested. They may or may not be logged, depending on the implementation details of the underlying library. If they are not for a particular library, please feel free to open an issue with the details.

  • When using OpenURI, the reading of the HTTP response body is deferred, so it is not available for logging. This will be noted in the logging statement:

      D, [2012-11-21T15:09:03.547005 #6857] DEBUG -- : [httplog] Connecting: localhost:80
      D, [2012-11-21T15:09:03.547938 #6857] DEBUG -- : [httplog] Sending: GET http://localhost:9292/index.html
      D, [2012-11-21T15:09:03.548615 #6857] DEBUG -- : [httplog] Status: 200
      D, [2012-11-21T15:09:03.548662 #6857] DEBUG -- : [httplog] Benchmark: 0.000617 seconds
      D, [2012-11-21T15:09:03.548695 #6857] DEBUG -- : [httplog] Response: (not available yet)
  • When using HTTPClient, the TCP connection establishment will be logged after the HTTP request and headers, due to the way HTTPClient is organized.

    D, [2012-11-22T18:39:46.031698 #12800] DEBUG -- : [httplog] Sending: GET http://localhost:9292/index.html
    D, [2012-11-22T18:39:46.031756 #12800] DEBUG -- : [httplog] Header: accept: */*
    D, [2012-11-22T18:39:46.031788 #12800] DEBUG -- : [httplog] Header: foo: bar
    D, [2012-11-22T18:39:46.031942 #12800] DEBUG -- : [httplog] Connecting: localhost:9292
    D, [2012-11-22T18:39:46.033409 #12800] DEBUG -- : [httplog] Status: 200
    D, [2012-11-22T18:39:46.033483 #12800] DEBUG -- : [httplog] Benchmark: 0.001562 seconds
  • When using Ethon or Patron, and any library based on them (such as Typhoeus), the TCP connection is not logged (since it's established by libcurl).

Running the specs

Make sure you have the necessary dependencies installed by running bundle install. Then simply run bundle exec rspec spec. This will launch a simple rack server on port 9292 and run all tests locally against that server.


If you have any issues with httplog, or feature requests, please add an issue on GitHub or fork the project and send a pull request. Please include passing specs with all pull requests.


Thanks to these fine folks for contributing pull requests:

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