The argument in the action URL is invalid when the "Lessons" form form is submitted

Submit a form today with the following information:

<form action= "add.php?a=123&b=456" >
<input type= "hidden" name= ' user_id ' value= "/>"
<input type= "hidden" name= ' user_name ' value= "Snsgou"/>
...
<input type= "Submit" Name= ' Sub ' value= "Commit"/>
</form>

Service side alive and alive gets not the value of parameter a and parameter B ,, through the fiddler tool Trace Analysis, found that the commit process went get way, I meant to POST submitted, A closer look, theform node less Set the method property , if not actively set, it is the default value of get, this will know the problem lies,,, pay attention to this place!!! Hope not to make the same mistake in the future!!!

Basic knowledge of Evil:

There are two forms when a page submits data to the server through a form (form), one is post and the other is get. One difference between the two is that get attaches the data directly behind the URL, and the data sent by the post is placed in the HTTP packet. The Action property of the form is the URL address of the data being submitted, and the method property can be specified as Get or post.

It is important to note that if a GET method is used, the parameters in the action URL are discarded , and the data in the form is only stitched to the server at the time of submission, but not in the same way as the POST . It submits the data according to the URL specified by the action, including the parameters and parameter values followed by the URL.

The argument in the action URL is invalid when the "Lessons" form form is submitted