REST Man -- simple DSL for accessing HTTP and REST resources

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A simple HTTP and REST client for Ruby, inspired by the Sinatra's microframework style of specifying actions: get, put, post, delete.

This is a fork version of rest-client


Supported Ruby versions

2.6 2.7 3.0 3.1 3.2 3.3-Preview

Supported JRuby versions

9.3 9.4

Usage: Raw URL

Basic usage:

require 'rest-man'

RestMan.get(url, headers={}), payload, headers={})

In the high level helpers, only POST, PATCH, and PUT take a payload argument. To pass a payload with other HTTP verbs or to pass more advanced options, use RestMan::Request.execute instead.

More detailed examples:

require 'rest-man'

RestMan.get ''

RestMan.get '', {params: {id: 50, 'foo' => 'bar'}}

RestMan.get 'https://user:[email protected]/private/resource', {accept: :json} '', {param1: 'one', nested: {param2: 'two'}} "", {'x' => 1}.to_json, {content_type: :json, accept: :json}

RestMan.delete ''

>> response = RestMan.get ''
=> <RestMan::Response 200 "<!doctype h...">
>> response.code
=> 200
>> response.cookies
=> {"Foo"=>"BAR", "QUUX"=>"QUUUUX"}
>> response.headers
=> {:content_type=>"text/html; charset=utf-8", :cache_control=>"private" ... }
>> response.body
=> "<!doctype html>\n<html>\n<head>\n    <title>Example Domain</title>\n\n ..." url,
    :transfer => {
      :path => '/foo/bar',
      :owner => 'that_guy',
      :group => 'those_guys'
     :upload => {
      :file =>, 'rb')

Passing advanced options

The top level helper methods like RestMan.get accept a headers hash as their last argument and don't allow passing more complex options. But these helpers are just thin wrappers around RestMan::Request.execute.

RestMan::Request.execute(method: :get, url: '',
                            timeout: 10)

RestMan::Request.execute(method: :get, url: '',
                            ssl_ca_file: 'myca.pem',
                            ssl_ciphers: 'AESGCM:!aNULL')

You can also use this to pass a payload for HTTP verbs like DELETE, where the RestMan.delete helper doesn't accept a payload.

RestMan::Request.execute(method: :delete, url: '',
                            payload: 'foo', headers: {myheader: 'bar'})

Due to unfortunate choices in the original API, the params used to populate the query string are actually taken out of the headers hash. So if you want to pass both the params hash and more complex options, use the special key :params in the headers hash. This design may change in a future major release.

RestMan::Request.execute(method: :get, url: '',
                            timeout: 10, headers: {params: {foo: 'bar'}})



Yeah, that's right! This does multipart sends for you! '/data', :myfile =>"/path/to/image.jpg", 'rb')

This does two things for you:

  • Auto-detects that you have a File value sends it as multipart
  • Auto-detects the mime of the file and sets it in the HEAD of the payload for each entry

If you are sending params that do not contain a File object but the payload needs to be multipart then: '/data', {:foo => 'bar', :multipart => true}

Usage: ActiveResource-Style

resource = ''

private_resource = '', 'user', 'pass'
private_resource.put'pic.jpg'), :content_type => 'image/jpg'

See RestMan::Resource module docs for details.

Usage: Resource Nesting

site ='')
site['posts/1/comments'].post 'Good article.', :content_type => 'text/plain'

See RestMan::Resource docs for details.

Exceptions (see

  • for result codes between 200 and 207, a RestMan::Response will be returned
  • for result codes 301, 302 or 307, the redirection will be followed if the request is a GET or a HEAD
  • for result code 303, the redirection will be followed and the request transformed into a GET
  • for other cases, a RestMan::ExceptionWithResponse holding the Response will be raised; a specific exception class will be thrown for known error codes
  • call .response on the exception to get the server's response
>> RestMan.get ''
Exception: RestMan::NotFound: 404 Not Found

>> begin
     RestMan.get ''
   rescue RestMan::ExceptionWithResponse => e
=> <RestMan::Response 404 "<!doctype h...">

Other exceptions

While most exceptions have been collected under RestMan::RequestFailed aka RestMan::ExceptionWithResponse, there are a few quirky exceptions that have been kept for backwards compatibility.

RestMan will propagate up exceptions like socket errors without modification:

>> RestMan.get 'http://localhost:12345'
Exception: Errno::ECONNREFUSED: Connection refused - connect(2) for "localhost" port 12345

RestMan handles a few specific error cases separately in order to give better error messages. These will hopefully be cleaned up in a future major release.

RestMan::ServerBrokeConnection is translated from EOFError to give a better error message.

RestMan::SSLCertificateNotVerified is raised when HTTPS validation fails. Other OpenSSL::SSL::SSLError errors are raised as is.


By default, rest-man will follow HTTP 30x redirection requests.

RestMan::Response exposes a #history method that returns a list of each response received in a redirection chain.

>> r = RestMan.get('')
=> <RestMan::Response 200 "{\n  \"args\":...">

# see each response in the redirect chain
>> r.history
=> [<RestMan::Response 302 "<!DOCTYPE H...">, <RestMan::Response 302 "">]

# see each requested URL
>> r.request.url
=> ""
>> {|x| x.request.url}
=> ["", ""]

Manually following redirection

To disable automatic redirection, set :max_redirects => 0.

>> RestMan::Request.execute(method: :get, url: '')
=> RestMan::Response 200 "{\n  "args":..."

>> RestMan::Request.execute(method: :get, url: '', max_redirects: 0)
RestMan::Found: 302 Found

To manually follow redirection, you can call Response#follow_redirection. Or you could of course inspect the result and choose custom behavior.

>> RestMan::Request.execute(method: :get, url: '', max_redirects: 0)
RestMan::Found: 302 Found
>> begin
       RestMan::Request.execute(method: :get, url: '', max_redirects: 0)
   rescue RestMan::ExceptionWithResponse => err
>> err
=> #<RestMan::Found: 302 Found>
>> err.response
=> RestMan::Response 302 "<!DOCTYPE H..."
>> err.response.headers[:location]
=> "/get"
>> err.response.follow_redirection
=> RestMan::Response 200 "{\n  "args":..."

Manually set max retries

The default max_retries is 1. You can change it to any number you like.

RestMan::Request.execute(method: :get, url: '', max_retires: 0)

Result handling

The result of a RestMan::Request is a RestMan::Response object.

RestMan::Response objects are a subclass of String.

Response objects have several useful methods. (See the class rdoc for more details.)

  • Response#code: The HTTP response code
  • Response#body: The response body as a string. (AKA .to_s)
  • Response#headers: A hash of HTTP response headers
  • Response#raw_headers: A hash of HTTP response headers as unprocessed arrays
  • Response#cookies: A hash of HTTP cookies set by the server
  • Response#cookie_jar: An HTTP::CookieJar of cookies
  • Response#request: The RestMan::Request object used to make the request
  • Response#history: If redirection was followed, a list of prior Response objects
➔ <RestMan::Response 200 "<!doctype h...">

rescue RestMan::ExceptionWithResponse => err
➔ <RestMan::Response 404 "<!doctype h...">

Response callbacks, error handling

A block can be passed to the RestMan method. This block will then be called with the Response. Response.return! can be called to invoke the default response's behavior.

# Don't raise exceptions but return the response
>> RestMan.get('') {|response, request, result| response }
=> <RestMan::Response 404 "<!doctype h...">
# Manage a specific error code
RestMan.get('') { |response, request, result, &block|
  case response.code
  when 200
    p "It worked !"
  when 423
    raise SomeCustomExceptionIfYouWant

But note that it may be more straightforward to use exceptions to handle different HTTP error response cases:

  resp = RestMan.get('')
rescue RestMan::Unauthorized, RestMan::Forbidden => err
  puts 'Access denied'
  return err.response
rescue RestMan::ImATeapot => err
  puts 'The server is a teapot! # RFC 2324'
  return err.response
  puts 'It worked!'
  return resp

For GET and HEAD requests, rest-man automatically follows redirection. For other HTTP verbs, call .follow_redirection on the response object (works both in block form and in exception form).

# Follow redirections for all request types and not only for get and head
# RFC : "If the 301, 302 or 307 status code is received in response to a request other than GET or HEAD,
#        the user agent MUST NOT automatically redirect the request unless it can be confirmed by the user,
#        since this might change the conditions under which the request was issued."

# block style'', 'body') { |response, request, result|
  case response.code
  when 301, 302, 307

# exception style by explicit classes
begin'', 'body')
rescue RestMan::MovedPermanently,
       RestMan::TemporaryRedirect => err

# exception style by response code
begin'', 'body')
rescue RestMan::ExceptionWithResponse => err
  case err.http_code
  when 301, 302, 307

Non-normalized URIs

If you need to normalize URIs, e.g. to work with International Resource Identifiers (IRIs), use the Addressable gem ( in your code:

  require 'addressable/uri'

Lower-level access

For cases not covered by the general API, you can use the RestMan::Request class, which provides a lower-level API.

You can:

  • specify ssl parameters
  • override cookies
  • manually handle the response (e.g. to operate on it as a stream rather than reading it all into memory)

See RestMan::Request's documentation for more information.

Streaming request payload

RestMan will try to stream any file-like payload rather than reading it into memory. This happens through RestMan::Payload::Streamed, which is automatically called internally by RestMan::Payload.generate on anything with a read method.

>> r = RestMan.put('','/tmp/foo.txt', 'r'),
                      content_type: 'text/plain')
=> <RestMan::Response 200 "{\n  \"args\":...">

In Multipart requests, RestMan will also stream file handles passed as Hash (or ParamsArray).

>> r = RestMan.put('',
                      {file_a:'a.txt', 'r'),
                       file_b:'b.txt', 'r')})
=> <RestMan::Response 200 "{\n  \"args\":...">

# received by server as two file uploads with multipart/form-data
>> JSON.parse(r)['files'].keys
=> ['file_a', 'file_b']

Streaming responses

Normally, when you use RestMan.get or the lower level RestMan::Request.execute method: :get to retrieve data, the entire response is buffered in memory and returned as the response to the call.

However, if you are retrieving a large amount of data, for example a Docker image, an iso, or any other large file, you may want to stream the response directly to disk rather than loading it in memory. If you have a very large file, it may become impossible to load it into memory.

There are two main ways to do this:

raw_response, saves into Tempfile

If you pass raw_response: true to RestMan::Request.execute, it will save the response body to a temporary file (using Tempfile) and return a RestMan::RawResponse object rather than a RestMan::Response.

Note that the tempfile created by will be in Dir.tmpdir (usually /tmp/), which you can override to store temporary files in a different location. This file will be unlinked when it is dereferenced.

If logging is enabled, this will also print download progress. Customize the interval with :stream_log_percent (defaults to 10 for printing a message every 10% complete).

For example:

>> raw = RestMan::Request.execute(
           method: :get,
           url: '',
           raw_response: true)
=> <RestMan::RawResponse @code=200, @file=#<Tempfile:/tmp/rest-man.20170522-5346-1pptjm1>, @request=<RestMan::Request @method="get", @url="">>
>> raw.file.size
=> 1554186240
>> raw.file.path
=> "/tmp/rest-man.20170522-5346-1pptjm1"
=> "/tmp/rest-man.20170522-5346-1pptjm1"

>> require 'digest/sha1'
>> Digest::SHA1.file(raw.file.path).hexdigest
=> "4375b73e3a1aa305a36320ffd7484682922262b3"

block_response, receives raw Net::HTTPResponse

If you want to stream the data from the response to a file as it comes, rather than entirely in memory, you can also pass RestMan::Request.execute a parameter :block_response to which you pass a block/proc. This block receives the raw unmodified Net::HTTPResponse object from Net::HTTP, which you can use to stream directly to a file as each chunk is received.

Note that this bypasses all the usual HTTP status code handling, so you will want to do you own checking for HTTP 20x response codes, redirects, etc.

The following is an example:'/some/output/file', 'w') {|f|
  block = proc { |response|
    response.read_body do |chunk|
      f.write chunk
  RestMan::Request.execute(method: :get,
                              url: '',
                              block_response: block)


The restman shell command gives an IRB session with RestMan already loaded:

$ restman
>> RestMan.get ''

Specify a URL argument for get/post/put/delete on that resource:

$ restman
>> put '/resource', 'data'

Add a user and password for authenticated resources:

$ restman user pass
>> delete '/private/resource'

Create ~/.restman for named sessions:

    url: http://localhost:4567
    url: http://localhost:9292
    username: user
    password: pass

Then invoke:

$ restman private_site

Use as a one-off, curl-style:

$ restman get > output_body

$ restman put < input_body


To enable logging globally you can:

  • set RestMan.log with a Ruby Logger
RestMan.log = STDOUT
  • or set an environment variable to avoid modifying the code (in this case you can use a file name, "stdout" or "stderr"):
$ RESTCLIENT_LOG=stdout path/to/my/program

You can also set individual loggers when instantiating a Resource or making an individual request:

resource = '', log:
RestMan::Request.execute(method: :get, url: '', log:

All options produce logs like this:

RestMan.get "http://some/resource"
# => 200 OK | text/html 250 bytes
RestMan.put "http://some/resource", "payload"
# => 401 Unauthorized | application/xml 340 bytes

Note that these logs are valid Ruby, so you can paste them into the restman shell or a script to replay your sequence of rest calls.


All calls to RestMan, including Resources, will use the proxy specified by RestMan.proxy:

RestMan.proxy = ""
RestMan.get "http://some/resource"
# => response from some/resource as proxied through

Often the proxy URL is set in an environment variable, so you can do this to use whatever proxy the system is configured to use:

  RestMan.proxy = ENV['http_proxy']

Specify a per-request proxy by passing the :proxy option to RestMan::Request. This will override any proxies set by environment variable or by the global RestMan.proxy value.

RestMan::Request.execute(method: :get, url: '',
                            proxy: '')
# => single request proxied through the proxy

This can be used to disable the use of a proxy for a particular request.

RestMan.proxy = ""
RestMan::Request.execute(method: :get, url: '', proxy: nil)
# => single request sent without a proxy

Query parameters

Rest-client can render a hash as HTTP query parameters for GET/HEAD/DELETE requests or as HTTP post data in x-www-form-urlencoded format for POST requests.

Even though there is no standard specifying how this should work, rest-man follows a similar convention to the one used by Rack / Rails servers for handling arrays, nested hashes, and null values.

The implementation in ./lib/rest-man/utils.rb closely follows Rack::Utils.build_nested_query, but treats empty arrays and hashes as nil. (Rack drops them entirely, which is confusing behavior.)

If you don't like this behavior and want more control, just serialize params yourself (e.g. with URI.encode_www_form) and add the query string to the URL directly for GET parameters or pass the payload as a string for POST requests.

Basic GET params:

RestMan.get('', params: {foo: 'bar', baz: 'qux'})
# GET ""

Basic x-www-form-urlencoded POST params:

>> r ='', {foo: 'bar', baz: 'qux'})
# POST "", data: "foo=bar&baz=qux"
=> <RestMan::Response 200 "{\n  \"args\":...">
>> JSON.parse(r.body)
=> {"args"=>{},
    "form"=>{"baz"=>"qux", "foo"=>"bar"},
        "Accept-Encoding"=>"gzip, deflate",

JSON payload: rest-man does not speak JSON natively, so serialize your payload to a string before passing it to rest-man.

>> payload = {'name' => 'newrepo', 'description': 'A new repo'}
>>'', payload.to_json, content_type: :json)
=> <RestMan::Response 201 "{\"id\":75149...">

Advanced GET params (arrays):

>> r = RestMan.get('', params: {foo: [1,2,3]})
# GET "[]=1&foo[]=2&foo[]=3"
=> <RestMan::Response 200 "Method: GET...">
>> puts r.body
query_string: "foo[]=1&foo[]=2&foo[]=3"
decoded:      "foo[]=1&foo[]=2&foo[]=3"

  {"foo"=>["1", "2", "3"]}

Advanced GET params (nested hashes):

>> r = RestMan.get('', params: {outer: {foo: 123, bar: 456}})
# GET "[foo]=123&outer[bar]=456"
=> <RestMan::Response 200 "Method: GET...">
>> puts r.body
query_string: "outer[foo]=123&outer[bar]=456"
decoded:      "outer[foo]=123&outer[bar]=456"

  {"outer"=>{"foo"=>"123", "bar"=>"456"}}

The RestMan::ParamsArray class allows callers to provide ordering even to structured parameters. This is useful for unusual cases where the server treats the order of parameters as significant or you want to pass a particular key multiple times.

Multiple fields with the same name using ParamsArray:

>> RestMan.get('', params:
        [[:foo, 1], [:foo, 2]]))
# GET ""

Nested ParamsArray:

>> RestMan.get('', params:
                  {foo:[[:a, 1], [:a, 2]])})
# GET "[a]=1&foo[a]=2"


Request headers can be set by passing a ruby hash containing keys and values representing header names and values:

# GET request with modified headers
RestMan.get '', {:Authorization => 'Bearer cT0febFoD5lxAlNAXHo6g'}

# POST request with modified headers '', {:foo => 'bar', :baz => 'qux'}, {:Authorization => 'Bearer cT0febFoD5lxAlNAXHo6g'}

# DELETE request with modified headers
RestMan.delete '', {:Authorization => 'Bearer cT0febFoD5lxAlNAXHo6g'}


By default the timeout for a request is 60 seconds. Timeouts for your request can be adjusted by setting the timeout: to the number of seconds that you would like the request to wait. Setting timeout: will override read_timeout:, open_timeout: and write_timeout.

RestMan::Request.execute(method: :get, url: '',
                            timeout: 120)

Additionally, you can set read_timeout:, open_timeout: and write_timeout separately.

RestMan::Request.execute(method: :get, url: '',
                            read_timeout: 120, open_timeout: 240, write_timeout: 120)


Request and Response objects know about HTTP cookies, and will automatically extract and set headers for them as needed:

response = RestMan.get ''
# => {"_applicatioN_session_id" => "1234"}

response2 =
  {:param1 => "foo"},
  {:cookies => {:session_id => "1234"}}
# ...response body

Response objects carry a cookie_jar method that exposes an HTTP::CookieJar of cookies, which supports full standards compliant behavior.

SSL/TLS support

Various options are supported for configuring rest-man's TLS settings. By default, rest-man will verify certificates using the system's CA store on all platforms. (This is intended to be similar to how browsers behave.) You can specify an :ssl_ca_file, :ssl_ca_path, or :ssl_cert_store to customize the certificate authorities accepted.

SSL Client Certificates
  :ssl_client_cert  =>"cert.pem")),
  :ssl_client_key   =>"key.pem"), "passphrase, if any"),
  :ssl_ca_file      =>  "ca_certificate.pem",
  :verify_ssl       =>  OpenSSL::SSL::VERIFY_PEER

Self-signed certificates can be generated with the openssl command-line tool.


RestMan.add_before_execution_proc add a Proc to be called before each execution. It's handy if you need direct access to the HTTP request.


# Add oauth support using the oauth gem
require 'oauth'
access_token = ...

RestMan.add_before_execution_proc do |req, params|
  access_token.sign! req

RestMan.get ''


REST Client Team Andy Brody
Creator Adam Wiggins
Maintainers Emeriti Lawrence Leonard Gilbert, Matthew Manning, Julien Kirch
Major contributions Blake Mizerany, Julien Kirch

A great many generous folks have contributed features and patches. See AUTHORS for the full list.

Released under the MIT License:

Photo of the International Space Station was produced by NASA and is in the public domain.