conncache: lowercase the hash key for better match

As host names are case insensitive, the use of case sensitive hashing
caused unnecesary cache misses and therefore lost performance. This
lowercases the hash key.

Reported-by: Harry Sintonen
Fixes #7159
Closes #7161

diff --git a/lib/conncache.c b/lib/conncache.c
index 5453c00f33e5bd74b241ec3dfc0fe708e1a096d2..a3cbe9fefe5a122d3ce41b93981a9b0da571e2ee 100644 (file)
--- a/lib/conncache.c
+++ b/lib/conncache.c
@@ -34,6 +34,7 @@
 #include "share.h"
 #include "sigpipe.h"
 #include "connect.h"
+#include "strcase.h"
 
 /* The last 3 #include files should be in this order */
 #include "curl_printf.h"
@@ -161,6 +162,7 @@ static void hashkey(struct connectdata *conn, char *buf,
 
   /* put the number first so that the hostname gets cut off if too long */
   msnprintf(buf, len, "%ld%s", port, hostname);
+  Curl_strntolower(buf, buf, len);
 }
 
 /* Returns number of connections currently held in the connection cache.