initial commit

chapter16/function_check_HTTP_server

@@ -0,0 +1,35 @@
+check_HTTP_server ()
+{
+LINX="/usr/local/bin/lynx"  # Define the location of the linx program
+URL=$1                      # Capture the target URL in the $1 position
+URLFILE=/tmp/HTTP.$$        # Define a file to hold the URL output
+
+###########################################
+
+$LINX "$URL" > $URLFILE     # Attempt to reach the target URL
+
+if (($? != 0))              # If the URL is unreachable - No Connection
+then
+    echo "\n$URL - Unable to connect\n"
+    cat $URLFILE
+else                        # Else the URL was found
+
+    while read VER RC STATUS   # This while loop is fed from the bottom
+                               # after the "done" using input redirection
+    do
+       case $RC in      # Check the return code in the $URLFILE
+
+       200|401|301|302) # These are valid return codes!
+                        echo "\nHTTP Server is OK\n"
+                        ;;
+                     *) # Anything else is not a valid return code
+
+                        echo "\nERROR: HTTP Server Error\n"
+                        ;;
+       esac
+
+     done < $URLFILE
+fi
+
+rm -f $URLFILE
+}