Some special situations of get and post

This article mainly introduces some special situations of get and post. For more information, see

This article mainly introduces some special situations of get and post. For more information, see

I recently encountered the following problems during my work on file upload:

Submit the form to a url with parameters (such as res. php? Param = aaa). What is the result?

Next we will test the get and post content from several examples. First, let's take a look at the simplest

<? Phpecho $ _ GET ['param'];?>

Submit the url with this parameter in get mode. The result is that the corresponding value is overwritten, and the obtained param is bbb.
What if the parameter in the url is different from the name in the form? See the following test example.

<? Phpecho $ _ GET ['param1']; echo"
"; Echo $ _ GET ['param2'];?>

The result shows that the value of param2 is obtained correctly, but the value of param1 is not obtained. It indicates that the parameters of the original url are removed when the request is submitted in get mode.
Next, let's take a look at the post submission process.

First, let's take a look at the situation where the name value is the same

<? Phpecho "get =". $ _ GET ['param']; echo"
"; Echo" post = ". $ _ POST ['param'];?>

In this case, the output result is aaa in get mode and bbb in post mode, which means that the get and post methods are isolated from each other in this case.
Next, let's take a look at how to get the parameters following the url through post.

<? Phpecho "get =". $ _ GET ['param2']; echo"
"; Echo" post = ". $ _ POST ['param1'];?>

In this case, all obtained parameters are null, so the get and post parameters in php are isolated from each other.
However, when you use java to upload files today, you can correctly retrieve all the data, that is, you can use the request in the servlet to obtain the form data of the post or the get data after the url. after all, the methods for obtaining parameters in servlet are the same.

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