Support PURGE request method.

Fixes joyent/node#2775.

http_parser.c

@@ -147,6 +147,7 @@ static const char *method_strings[] =
   , "SUBSCRIBE"
   , "UNSUBSCRIBE"
   , "PATCH"
+  , "PURGE"
   };
 
 
@@ -914,7 +915,7 @@ size_t http_parser_execute (http_parser *parser,
           case 'N': parser->method = HTTP_NOTIFY; break;
           case 'O': parser->method = HTTP_OPTIONS; break;
           case 'P': parser->method = HTTP_POST;
-            /* or PROPFIND or PROPPATCH or PUT or PATCH */
+            /* or PROPFIND|PROPPATCH|PUT|PATCH|PURGE */
             break;
           case 'R': parser->method = HTTP_REPORT; break;
           case 'S': parser->method = HTTP_SUBSCRIBE; break;
@@ -968,14 +969,18 @@ size_t http_parser_execute (http_parser *parser,
           if (ch == 'R') {
             parser->method = HTTP_PROPFIND; /* or HTTP_PROPPATCH */
           } else if (ch == 'U') {
-            parser->method = HTTP_PUT;
+            parser->method = HTTP_PUT; /* or HTTP_PURGE */
           } else if (ch == 'A') {
             parser->method = HTTP_PATCH;
           } else {
             goto error;
           }
-        } else if (parser->index == 2 && parser->method == HTTP_UNLOCK && ch == 'S') {
+        } else if (parser->index == 2) {
-          parser->method = HTTP_UNSUBSCRIBE;
+          if (parser->method == HTTP_PUT) {
+            if (ch == 'R') parser->method = HTTP_PURGE;
+          } else if (parser->method == HTTP_UNLOCK) {
+            if (ch == 'S') parser->method = HTTP_UNSUBSCRIBE;
+          }
         } else if (parser->index == 4 && parser->method == HTTP_PROPFIND && ch == 'P') {
           parser->method = HTTP_PROPPATCH;
         } else {

http_parser.h

@@ -116,6 +116,7 @@ enum http_method
   , HTTP_UNSUBSCRIBE
   /* RFC-5789 */
   , HTTP_PATCH
+  , HTTP_PURGE
   };
 
 

test.c

@@ -830,6 +830,26 @@ const struct message requests[] =
   ,.body= "q=42"
   }
 
+#define PURGE_REQ 30
+, {.name = "PURGE request"
+  ,.type= HTTP_REQUEST
+  ,.raw= "PURGE /file.txt HTTP/1.1\r\n"
+         "Host: www.example.com\r\n"
+         "\r\n"
+  ,.should_keep_alive= TRUE
+  ,.message_complete_on_eof= FALSE
+  ,.http_major= 1
+  ,.http_minor= 1
+  ,.method= HTTP_PURGE
+  ,.query_string= ""
+  ,.fragment= ""
+  ,.request_path= "/file.txt"
+  ,.request_url= "/file.txt"
+  ,.num_headers= 1
+  ,.headers= { { "Host", "www.example.com" } }
+  ,.body= ""
+  }
+
 , {.name= NULL } /* sentinel */
 };