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# Understanding GET and POST

### GET : is used to get resource from the server:

Ex : Just change the method from post to get in the form and hit the URL.

![](/files/-LcoT6fnej3ItsX3CyPc)

#### Observation :

![](/files/-LcoTCPPnATPSExNlIz_)

#### URL after submitting form :

```markup
http://localhost:8080/SimpleServletProject/xmlservletpath?userName=Mohit&lastName=malhotra&profession=Manager&countries=India&cities=Mumbai
```

1\) All the parameters are sent as query parameters in the GET request.

2\) Refresh the browser and the GET operation will have same effect , browser will not warn us.

### POST : is user to create resource on the server:

![](/files/-LcoUFtCaJWpYB3oK0Ib)

#### Observation :

![](/files/-LcoUIkpMnkvGEjnTOv1)

On Refreshing we got the confirm  Resubmission  message from the browser :

![](/files/-LcoUOcHzE7pmI5ForYn)

### HttpServlet is a java specification :

#### Download Apache tomcat Doc : ( from source code distribution)

![](/files/-LcoW_Nb3xXt49bVYhmW)

#### Extract it

![](/files/-LcoWguBQDsi9RQyp1Xv)

#### Attach source : (Option will come when you try to open HttpServlet class )

![](/files/-LcoWmxSVXHu96AMHN-O)

#### Check all the methods of HttpServlet provided by Tomcat:

![](/files/-LcoWykqsUgqOUnZTe62)

{% hint style="warning" %}
If we do not override doGet or doPost method then tomcat will call its own doGet or doPost methods.
{% endhint %}


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