=== modified file 'src/HttpMsg.cc'
--- src/HttpMsg.cc	2009-07-26 11:33:16 +0000
+++ src/HttpMsg.cc	2009-07-27 13:55:53 +0000
@@ -154,8 +154,7 @@
 
     // sanity check the start line to see if this is in fact an HTTP message
     if (!sanityCheckStartLine(buf, hdr_len, error)) {
-        debugs(58,1, HERE << "first line of HTTP message is invalid");
-        // NP: sanityCheck sets *error
+        // NP: sanityCheck sets *error and sends debug warnings.
         return false;
     }
 

=== modified file 'src/HttpReply.cc'
--- src/HttpReply.cc	2009-07-26 12:04:45 +0000
+++ src/HttpReply.cc	2009-07-27 14:59:48 +0000
@@ -446,8 +446,10 @@
     // content is long enough to possibly hold a reply
     // 4 being magic size of a 3-digit number plus space delimiter
     if ( buf->contentSize() < (protoPrefix.size() + 4) ) {
-        if (hdr_len > 0)
+        if (hdr_len > 0) {
+            debugs(58, 3, "HttpReply::sanityCheckStartLine: Too small reply header (" << hdr_len << " bytes)");
             *error = HTTP_INVALID_HEADER;
+        }
         return false;
     }
 

=== modified file 'src/HttpRequest.cc'
--- src/HttpRequest.cc	2009-07-26 11:33:16 +0000
+++ src/HttpRequest.cc	2009-07-27 14:59:29 +0000
@@ -156,6 +156,7 @@
     if ( buf->contentSize() < 2 ) {
         // this is ony a real error if the headers apparently complete.
         if (hdr_len > 0) {
+            debugs(58, 3, "HttpRequest::sanityCheckStartLine: Too small request header (" << hdr_len << " bytes)");
             *error = HTTP_INVALID_HEADER;
         }
         return false;

=== modified file 'src/pconn.cc'
--- src/pconn.cc	2009-02-19 02:17:28 +0000
+++ src/pconn.cc	2009-07-27 08:04:11 +0000
@@ -188,7 +188,7 @@
     else
         snprintf(buf, SQUIDHOSTNAMELEN * 3 + 10, "%s:%d", host, (int) port);
 
-    debugs(48,6,"PconnPool::key(" << host << "," << port << "," << domain << "," << inet_ntoa(*client_address) << "is {" << buf << "}" );
+    debugs(48,6,"PconnPool::key(" << (host?host:"") << "," << port << "," << (domain?domain:"") << "," << (client_address?inet_ntoa(*client_address):"") << "is {" << buf << "}" );
     return buf;
 }