diff --git a/check_curl b/check_curl
index 6953b64..4a12376 100755
--- a/check_curl
+++ b/check_curl
@@ -86,10 +86,45 @@ fi
 RESPONSE=$(curl --output "$TMP_RESPONSE" -w "%{http_code}\n%{time_total}" $(echo "${HEADER_ARGS[@]}" | tr -s ' ') $FOLLOW_REDIRECTS $INSECURE $RESOLVE $URL 2>"$TMP_ERROR_LOG")
 
 # shellcheck disable=SC2181
-if [ $? -ne 0 ]; then
-  echo "CRITICAL: curl failed!"
-  echo "Error log:"
-  cat "$TMP_ERROR_LOG"
+status=$?
+if [ $status -ne 0 ]; then
+  case $status in
+  1)
+    msg="CRITICAL: Unsupported protocol"
+    ;;
+  3)
+    msg="CRITICAL: Malformed URL"
+    ;;
+    #    5)
+    #      msg="CRITICAL: Couldn't resolve proxy $proxy"
+    #      ;;
+  6)
+    msg="CRITICAL: Couldn't resolve host"
+    ;;
+    #  7)
+    #    msg="CRITICAL: Couldn't connect to proxy $proxy"
+    #    ;;
+  22)
+    msg="CRITICAL: Server returned http code >= 400"
+    ;;
+  52)
+    msg="CRITICAL: Server returned empty response (52)"
+    ;;
+  56)
+    msg="CRITICAL: Failure recieving network data (56)"
+    ;;
+  60)
+    msg="CRITICAL: SSL/TLS connection problem (60)"
+    ;;
+  *)
+    echo "UNKNOWN: $status - $URL"
+    exit 3
+    ;;
+  esac
+
+  echo -e "$msg"
+  #  echo "Error log:"
+  #  cat "$TMP_ERROR_LOG"
   rm -rf "$TMP_ERROR_LOG"
   exit 2
 fi