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ItвЂ™s a sort of generalized naming system that everyone sticks to. So, all APIs will return a 404 if the resource is not found, and this means developers will understand what type of response theyвЂ™re getting. HTTP codes are very standard, and each number corresponds to a specific response. For example, when you try to go to a page that doesn't exist, you'll see something like:ДЄnother important response code to know is 200 OKВ - which means your request was successful, and your response is good to go! In general, the rule of thumb for HTTP response codes is: You may haveВ seen this on a few websites. There are a lot of different response codes - one you are probably familiar with is 404 Not Found.

REDВ рџ”ґВ : вЂњWe could not find anything about this request!вЂќ

GREENВ вњ…В : вЂњThis request was successfully processed.вЂќ When a client sends a request like, вЂњHey, can you send me all the tweets for this user?вЂќ You can think of the response code as something like a traffic light рџљҐ telling you: Here are the requests in Postman: A successful HTTP status code An unsuccessful HTTP status code TheВ HTTP response codeВ helps the developer or client understand the statusВ of the response. This is rare, though! In such cases, your best friend is the HTTP response code.

However, the message isnвЂ™t enough, and sometimes APIs don't send any messages at all, whether the request is successful or not. In Postman, you can see a response message that looks like this: A typical response messageДЄnd if it is unsuccessful? What happens then? Do we get different information? рџ¤”Д®xactly! If the request was unsuccessful, the message body could have an error message: An unsuccessful request HTTP Version + HTTP Response Code + Headers + Message Body A typical response structure Request structure done вњ… ! LetвЂ™s move on to responses.ДЄ responseВ message has a similar format to the request: YouвЂ™ll learn more about this in the coming chapters. See how the message body is optional in both cases? This means that it is totally possible to send an empty message body depending on the API actions you want.

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You want to add or update a userвЂ™s information, so you add the user details (name, last name, address, etc.) in the body (in JSON). YouвЂ™ll find this information in the documentation of the API youвЂ™re using. Quick reminder: JSON is widely used, but certain APIs might only accept XML. It contains the actual data of the resource you are trying to create or update. When making a request, this is only used with PUT or POST HTTP verbs. A message body Message BodyДЄnd finally, the message body.

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You can check out this full listВ of header options.

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User-Agent: Mozilla/5.0 (Macintosh Intel Mac OS X 10_10_5) Headers are in a key-valueВ pair, and there areВ manyВ different types of options for them. Headers in a requestДЄ headerВ enables you to pass along additional information about the message. In practice, with a real ID, the path would look more like this: users/145. You use :user_id to represent the user ID вЂ“ itвЂ™s a placeholder. Why have we suddenly switched from using a number to :user_id ? рџ¤” You should see this: Field used to make a request in Postman Now that youвЂ™ve launched the program, letвЂ™s take a look at what a request looks like in Postman.

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It can look different depending on the software or language you use. HTTP Verb + URI + HTTP Version + Headers + Optional Message Body A typical request structure рџѓ Make a Request on Postman The Structure of Requests Perfect! And now we can move onto making requests. The download button for Postman on MacBook Once youвЂ™ve done that, youвЂ™ll be redirected to a page for downloading the software. Postman is available for use with Linux, Windows, and OS X. ItвЂ™s time to take the plunge and download Postman. It has a sleek user interface you can make requests easily. You can use it no matter what language youвЂ™re programming in. Because there are lots of pros to this particular interface: