关于URL最大长度限制的相关资料查证
在开发调试支付宝接口时，突然发现支付宝接口的URL很长，远远大于之前自己印象中的255个字符。赶紧搜索查证了一番，理解如下：
URL不能大于255bytes的说法确实存在，在RFC2616中提到：
TheHTTPprotocoldoesnotplaceanyapriorilimitonthelengthofaURI.ServersMUSTbeabletohandletheURIofanyresourcetheyserve,andSHOULDbeabletohandleURIsofunboundedlengthiftheyprovideGET-basedformsthatcouldgeneratesuchURIs.AserverSHOULDreturn414(Request-URITooLong)statusifaURIislongerthantheservercanhandle(seesection10.4.15).
Note:ServersoughttobecautiousaboutdependingonURIlengthsabove255bytes,becausesomeolderclientorproxyimplementationsmightnotproperlysupporttheselengths.