既然我习惯了ABNF,我就试着用它.2.4.Hence, the same ABNF-based grammar may have multiple external
encodings, such as one for a 7-bit US-ASCIIEncoding details are beyond the scope of
现在,我已经在一个文件中创建了ABNF格式的sip语法(命名为sip.abnf)。PRACK,REFER,NOTIFY我创建了一个Perl程序,使用ABNF语法来验证上面的头消息,将其命名为testSipHeader.pl,内容如下:use File::Slurp;
use Parse::ABNF ;