ruby：未定义的方法`＆gt;＆gt;' for“\ x0F”：String（NoMethodError）

Question

使用Apache和FastCGI访问我的Redmine安装时遇到这样的错误。可能是什么原因？

/usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:454:in `read_length': undefined method `>>' for "\x0F":String (NoMethodError)
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:448:in `read_pair'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:441:in `parse_values'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:435:in `parse'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:195:in `read_record'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:126:in `next_request'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:116:in `session'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:104:in `each_request'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/fcgi-0.8.8/lib/fcgi.rb:36:in `each'
        from /usr/local/rvm/rubies/ruby-1.9.3-p374/lib/ruby/gems/1.9.1/gems/rack-1.4.4/lib/rack/handler/fastcgi.rb:27:in `run'
        from /var/www/redmine/public/dispatch.fcgi:21:in `<main>'

错误中提到的行如下（带行号），它是fcgi.rg文件的一个片段：

453   def self::read_length(buf)
454     if buf[0] >> 7 == 0
455     then buf.slice!(0,1)[0]
456     else buf.slice!(0,4).unpack('N')[0] & ((1<<31) - 1)
457     end
458   end

谢谢， 标记

Answer 1

好吧，我不确切知道发生了什么，但错误本身告诉你buf [0]是一个字符串，它不响应按位移位运算符（＆gt;＆gt;）。 / p>

我不确定这是否是100％正确的调试方法，但是如果你尝试解压缩该字符串，你会得到它的十进制值：

irb(main):053:0> "\x0F".unpack "c"
=> [15]

如果你在http://www.asciitable.com/看一看，显然这是“转变”角色。因此，不知何故，缓冲区会读取“移入”字符，当它试图对该字符进行逐位移位时，ruby正在抱怨。

我会检查它正在处​​理的文件，看看那里是否有任何可疑或非法字符。