I developed a simple HTTP server myself, but it gets stuck every time the form is submitted. . Can anyone help me figure out where the problem is?

This is the content of my form, which is a very simple three input boxes

    if(bufferedReader.ready()) {
        StringBuilder stringBuilder = new StringBuilder() ;
        int ch ;
        while((ch = bufferedReader.read()) != -1){
            stringBuilder.append((char)ch) ;
            System.out.println(stringBuilder) ;
        }

        line = stringBuilder.toString() ;
    }
    

I encapsulated the input stream of the socket in this bufferReader, and then it got stuck every time while((ch = bufferedReader.read()) != -1){This line

#The output of the console shows that all the form content has been obtained, but why not return -1? Is it because the browser uses HTTP1.1 and is waiting for the return result to enter the next request? Or is there something wrong with my program? I use blocking IO