provide a more general purpose request function

This allows for more flexibility in the future. Most importantly being
able to do more than just GET requests but any HTTP method. Specifically
needed for DELETE requests.

acme.sh

@@ -1592,12 +1592,17 @@ _post() {
   return $_ret
 }
 
-# url getheader timeout
 _get() {
-  _debug GET
+  _request "$1" "$2" "$3" GET
+}
+
+# url getheader timeout
+_request() {
   url="$1"
   onlyheader="$2"
   t="$3"
+  method="$4"
+  _debug method $method
   _debug url "$url"
   _debug "timeout" "$t"
 
@@ -1611,6 +1616,9 @@ _get() {
     if [ "$t" ]; then
       _CURL="$_CURL --connect-timeout $t"
     fi
+    if [ "$method" ]; then
+      _CURL="$_CURL -X $method"
+    fi
     _debug "_CURL" "$_CURL"
     if [ "$onlyheader" ]; then
       $_CURL -I --user-agent "$USER_AGENT" -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" "$url"
@@ -1633,6 +1641,9 @@ _get() {
     if [ "$t" ]; then
       _WGET="$_WGET --timeout=$t"
     fi
+    if [ "$method" ]; then
+      _WGET="$_WGET --method=$method"
+    fi
     _debug "_WGET" "$_WGET"
     if [ "$onlyheader" ]; then
       $_WGET --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" -S -O /dev/null "$url" 2>&1 | sed 's/^[ ]*//g'