无法将文本从html文件发送到c文件

I'm trying to write a very basic html file and a cgi script. The HTML file will have one text box and a button. The button will send the contents of the text box to a cgi file (without the content of the text box showing up in the url) which will simply print out the contents of the text box. Instead of that happening, my cgi file simply prints out '-|' regardless of what I put in the text box.I'm trying to write a very basic html file and