java - What's the difference between encodeURL and encodeRedirectURL? -

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i've seen existing question: difference between encodeurl , encoderedirecturl. doesn't answer question really. in testing, these 2 methods same. whatever use print or sendredirect, both work fine.

so there difference? want see source code maybe can find difference, httpservletresponse interface no implementation. implementation code?

but httpservletresponse interface no implementation. implementation code?

it's servletcontainer concrete servlet api implementation. in case of example apache tomcat concrete implementation org.apache.catalina.connector.response. here extracts of relevance:

 1128       /**  1129        * encode session identifier associated response  1130        * specified redirect url, if necessary.  1131        *  1132        * @param url url encoded  1133        */  1134       public string encoderedirecturl(string url) {  1135     1136           if (isencodeable(toabsolute(url))) {  1137               return (toencoded(url, request.getsessioninternal().getidinternal()));  1138           } else {  1139               return (url);  1140           }  1141     1142       } 
 1159       /**  1160        * encode session identifier associated response  1161        * specified url, if necessary.  1162        *  1163        * @param url url encoded  1164        */  1165       public string encodeurl(string url) {  1166             1167           string absolute = toabsolute(url);  1168           if (isencodeable(absolute)) {  1169               // w3c spec said   1170               if (url.equalsignorecase("")){  1171                   url = absolute;  1172               }  1173               return (toencoded(url, request.getsessioninternal().getidinternal()));  1174           } else {  1175               return (url);  1176           }  1177     1178       }

the difference subtle. encodeurl() uses full absolute url whenever given (relative) url empty.


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