More specifically, this means crafting the correct URL, HTTP headers for authentication, pagination, response format, and finally, the body of the request which is most likely either as form data ( application/x-www-form-urlencoded) or as JSON. More likely than not, being the client is going to mean having to make HTTP requests and parse JSON responses. But with backend development going more and more to a microservices architecture, our Rails apps are going to more often have to act as the client in addition to the server. We can tail the logs to see what the incoming request looks like (the path, headers, params), how we responded, etc.
#RUBY HTTP CLIENT HOW TO#
In Rails, our apps are often the ones acting as the server, and we typically know how to troubleshoot the issues that inevitably arise. There are always two parties involved: The Client and the Server. hostname, uri.An API doesn’t exist on its own. stat 'cached_response' req = Net :: HTTP :: Get. See RFC 2616 section 9.3 for further details. If the files has not been modified since the time in the header a Not Modified response will be returned. The following example performs a conditional GET using the If-Modified-Since header. Other requests that can contain a body such as PUT can be created in the same way using the corresponding request class ( Net::HTTP::Put).
To send multipart/form-data use Net::HTTPRequest#body= and Net::HTTPRequest#content_type=: req = Net :: HTTP :: Post. value endĪt this time Net::HTTP does not support multipart/form-data. request( req)Įnd case res when Net :: HTTPSuccess, Net :: HTTPRedirection # OK else res. This example creates a urlencoded POST body: uri = URI( '') value end end print fetch( '')Ī POST can be made using the Net::HTTP::Post request class. to_hash # => Array puts "Headers: #" fetch( location, limit - 1)Įlse response. get_fields( 'set-cookie') # => Array res. You can manually close the connection with finish.įor all the Net::HTTP request objects and shortcut request methods you may supply either a String for the request path or a URI from which Net::HTTP will extract the request path. request will automatically open a connection to the server if one is not currently open. If you wish to re-use a connection across multiple HTTP requests without automatically closing it you can use ::new instead of ::start. The request types Net::HTTP supports are listed below in the section “HTTP Request Classes”. The connection will remain open for multiple requests in the block if the server indicates it supports persistent connections. Net::HTTP::start immediately creates a connection to an HTTP server which is kept open for the duration of the block. request request # Net::HTTPResponse object end port) do | http | request = Net :: HTTP :: Get.
#RUBY HTTP CLIENT CODE#
The following example code can be used as the basis of a HTTP user-agent which can perform a variety of request types using persistent connections. body POST with Multiple Values ¶ ↑ uri = URI( '') get( uri) # => String GET with Dynamic Parameters ¶ ↑ uri = URI( '')
get( '', '/index.html') # => String GET by URI ¶ ↑ uri = URI( '') They are not recommended if you are performing many HTTP requests. The Net::HTTP methods in the following section do not persist connections. This will also require 'uri' so you don't need to require it separately. Simple Examples ¶ ↑Īll examples assume you have loaded Net::HTTP with: require 'net/http' If you are only performing a few GET requests you should try OpenURI. URI::HTTP#host, URI::HTTP#port and URI::HTTP#request_uri are designed to work with Net::HTTP. For more details about HTTP see ( Net::HTTP is designed to work closely with URI. Net::HTTP provides a rich library which can be used to build HTTP user-agents.
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