http错误代码含义

参考一下：
  http错误代码含义：
"100 "   :   Continue  
"101 "   :   witching   Protocols  
"200 "   :   OK  
"201 "   :   Created  
"202 "   :   Accepted  
"203 "   :   Non-Authoritative   Information  
"204 "   :   No   Content  
"205 "   :   Reset   Content  
"206 "   :   Partial   Content  
"300 "   :   Multiple   Choices  
"301 "   :   Moved   Permanently  
"302 "   :   Found  
"303 "   :   See   Other  
"304 "   :   Not   Modified  
"305 "   :   Use   Proxy  
"307 "   :   Temporary   Redirect  
"400 "   :   Bad   Request  
"401 "   :   Unauthorized  
"402 "   :   Payment   Required  
"403 "   :   Forbidden  
"404 "   :   Not   Found  
"405 "   :   Method   Not   Allowed  
"406 "   :   Not   Acceptable  
"407 "   :   Proxy   Authentication   Required  
"408 "   :   Request   Time-out  
"409 "   :   Conflict  
"410 "   :   Gone  
"411 "   :   Length   Required  
"412 "   :   Precondition   Failed  
"413 "   :   Request   Entity   Too   Large  
"414 "   :   Request-URI   Too   Large  
"415 "   :   Unsupported   Media   Type  
"416 "   :   Requested   range   not   satisfiable  
"417 "   :   Expectation   Failed  
"500 "   :   Internal   Server   Error  
"501 "   :   Not   Implemented  
"502 "   :   Bad   Gateway  
"503 "   :   Service   Unavailable  
"504 "   :   Gateway   Time-out  
"505 "   :   HTTP   Version   not   supported