Added first draft of http_check and related config example

.gitignore

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+.httpcheck_telegram

example_configs/httpcheck_telegram

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+# Bot Info
+CHATID="5555555"
+KEY="THISISAUNIQUEANDPRIVATEKEY"
+
+# Site list (file location)
+CHKLIST="${HOME}/.site_check"
+

http_check

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+#!/bin/sh
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
+
+# Load Telegram bot info
+source .httpcheck_telegram  #Provides KEY, CHATID, CHKLIST
+
+TIME="10"
+URL="https://api.telegram.org/bot$KEY/sendMessage"
+
+#Telegram message function
+send_message() {
+    curl -s --max-time $TIME -d "chat_id=${CHATID}&disable_web_page_preview=1&text=$1" $URL >/dev/null
+}
+
+get_http_code() {
+    curl -sILk --max-time $TIME $1 | grep HTTP | tail -n 1 | grep -Eo '[0-9]{3}' || printf '%s\n' 000
+}
+
+# Check HTTP codes
+for site in $(< $CHKLIST); do
+    respcode=$(get_http_code $site)
+    case $respcode in
+        000)
+            printf '%s\n' "[$(date '+%Y%m%d %H:%M:%S')]: PROBLEM -- $site: DNS record not found" >&2
+            send_message "HTTP/S Alert:%0A  $site DNS record not found." && printf '%s\n' "Message sent via Telegram bot" >&2
+            ;;
+        200)
+            printf '%s\n' "[$(date '+%Y%m%d %H:%M:%S')]: OK -- $site returns $respcode"
+            ;;
+        *)
+            printf '%s\n' "[$(date '+%Y%m%d %H:%M:%S')]: PROBLEM -- $site returns $respcode" >&2
+            send_message "HTTP/S Alert:%0A  $site responding with $respcode." && printf '%s\n' "Message sent via Telegram bot" >&2
+            ;;
+    esac
+done || exit 1
+
+exit 0
+