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Key Differences between PUT and POST

PUT method is called when you have to modify a single resource, while POST method is called when you have to add a child resource.

PUT method responses can be cached, but you cannot cache POST method responses.

You can use UPDATE query in PUT, whereas you can use create query in POST.

In PUT method, the client decides which URI resource should have, and in POST method, the server decides which URI resource should have.

PUT works as specific, while POST work as abstract.

If you send the same PUT request multiple times, the result will remain the same, but if you send the same POST request multiple times, you will receive different results.

PUT method is idempotent, whereas POST method is not idempotent.

PUT vs POST

What is PUT Method?

PUT method is used to update resource available on the server. Typically, it replaces whatever exists at the target URL with something else. You can use it to make a new resource or overwrite an existing one. PUT requests that the enclosed entity must be stored under the supplied requested URI (Uniform Resource Identifier).

What is POST Method?

POST is a method that is supported by HTTP and

depicts that a web server accepts the data included in the body of the message, which is requested. POST is often used by World Wide Web to send user generated data to the web server or when you upload file.

Differences between PUT and POST in REST APIs

Here is the important difference between PUT and POST method:

PUT POST

This method is idempotent. This method is not idempotent.

PUT method is call when you have to modify a single resource, which is already a part of resource collection. POST method is call when you have to add a child resource under resources collection.

RFC-2616 depicts that the PUT method sends a request for an enclosed entity stored in the supplied request URI. This method requests the server to accept the entity which is enclosed in the request.

PUT method syntax is PUT /questions/{question-id} POST method syntax is POST /questions

PUT method answer can be cached. You cannot cache PUT method responses.

PUT /vi/juice/orders/1234 indicates that you are updating a resource which is identified by “1234”. POST /vi/juice/orders indicates that you are creating a new resource and return an identifier to describe the resource.

If you send the same request multiple times, the result will remain the same. If you send the same POST request more than one time, you will receive different results.

PUT works as specific. POST work as abstract.

We use UPDATE query in PUT. We use create query in POST.

In PUT method, the client decides which URI resource should have. In POST method, the server decides which URI resource should have.

Example of PUT

Here is the webserver example of a PUT method:

Request

PUT chúng tôi HTTP/1.1 Content-type: text/html Content-length: 20

Responses

If the target resource having current representation and is modified with the state of the enclosed representation, then the server should send two responses. The first response code is 200 (OK), and the second response code is 204 (No Content).

If the target resource does not have any representation, then the server should inform the user by sending a 201 code (Created) response.

HTTP/1.1 201 Created Content-Location: /new.html Example of POST

Here is an example of POST method:

A form using the default application/x-www-form-urlencoded content type:

POST /test HTTP/1.1 Host: abc.example Content-Type: application/x-www-form-urlencoded Content-Length: 40 field1=value1&field2=value2 Testing an API with PUT requests

Here are the steps to test API with PUT requests:

Testing an API with PUT requests

Step 1) Update resources with PUT request.

Step 2) Use GET method for resource. If the PUT request success, you will receive new data. This method will fail if the supplied data in the request is invalid. Therefore, it will not update anything.

Testing an API with POST requests

Here are the steps to test API with POST requests:

Testing an API with POST requests

Step 1) Create a resource using POST request and make sure that it returns 200 status code.

Step 2) Make a GET request for that resource and save the data in the correct format.

Step 3) You have to add tests which ensure POST requests fail with incorrect data.

Advantages of PUT Method

Here are pros/benefits of using PUT method:

It helps you to store the supplied entity under the supplied URI

If the supplied entity already exists, then you can perform the update operation, or you can create with that URI.

You can create a resource as many times as you like.

Creating a resource with PUT method is very easy.

It can identify the entity enclosed with the request.

Advantages of POST Method

Here are pros/benefits of using POST method:

This method helps you to determine resource URI.

Specifying a new resource location header is very easy using location header.

You can send a request to accept the entity as a new subordinate of the resource, which is identified by the URI.

You can send user-generated data to the web server.

It is very useful when you do not know URL to keep any resource.

Use POST when you need the server, which controls URL generation of your resources.

POST is a secure method as its requests do not remain in browser history.

You can effortlessly transmit a large amount of data using post.

You can keep the data private.

This method can be used to send binary as well as ASCII data.

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