diff --git a/acme.sh b/acme.sh
index 93112a1a..8ee22479 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1827,23 +1827,29 @@ _send_signed_request() {
         nonceurl="$ACME_NEW_NONCE"
         if _post "" "$nonceurl" "" "HEAD" "$__request_conent_type"; then
           _headers="$(cat "$HTTP_HEADER")"
+          _debug2 _headers "$_headers"
+          _CACHED_NONCE="$(echo "$_headers" | grep -i "Replay-Nonce:" | _head_n 1 | tr -d "\r\n " | cut -d ':' -f 2)"
         fi
       fi
-      if [ -z "$_headers" ]; then
+      if [ -z "$_CACHED_NONCE" ]; then
         _debug2 "Get nonce with GET. ACME_DIRECTORY" "$ACME_DIRECTORY"
         nonceurl="$ACME_DIRECTORY"
         _headers="$(_get "$nonceurl" "onlyheader")"
+        _debug2 _headers "$_headers"
+        _CACHED_NONCE="$(echo "$_headers" | grep -i "Replay-Nonce:" | _head_n 1 | tr -d "\r\n " | cut -d ':' -f 2)"
       fi
-
+      if [ -z "$_CACHED_NONCE" ] && [ "$ACME_NEW_NONCE" ]; then
+        _debug2 "Get nonce with GET. ACME_NEW_NONCE" "$ACME_NEW_NONCE"
+        nonceurl="$ACME_NEW_NONCE"
+        _headers="$(_get "$nonceurl" "onlyheader")"
+        _debug2 _headers "$_headers"
+        _CACHED_NONCE="$(echo "$_headers" | grep -i "Replay-Nonce:" | _head_n 1 | tr -d "\r\n " | cut -d ':' -f 2)"
+      fi
+      _debug2 _CACHED_NONCE "$_CACHED_NONCE"
       if [ "$?" != "0" ]; then
         _err "Can not connect to $nonceurl to get nonce."
         return 1
       fi
-
-      _debug2 _headers "$_headers"
-
-      _CACHED_NONCE="$(echo "$_headers" | grep "Replay-Nonce:" | _head_n 1 | tr -d "\r\n " | cut -d ':' -f 2)"
-      _debug2 _CACHED_NONCE "$_CACHED_NONCE"
     else
       _debug2 "Use _CACHED_NONCE" "$_CACHED_NONCE"
     fi
@@ -2060,6 +2066,7 @@ _clearcaconf() {
 _startserver() {
   content="$1"
   ncaddr="$2"
+  _debug "content" "$content"
   _debug "ncaddr" "$ncaddr"
 
   _debug "startserver: $$"
@@ -2086,8 +2093,14 @@ _startserver() {
     SOCAT_OPTIONS="$SOCAT_OPTIONS,bind=${ncaddr}"
   fi
 
+  _content_len="$(printf "%s" "$content" | wc -c)"
+  _debug _content_len "$_content_len"
   _debug "_NC" "$_NC $SOCAT_OPTIONS"
-  $_NC $SOCAT_OPTIONS SYSTEM:"sleep 1; echo HTTP/1.0 200 OK; echo ; echo  $content; echo;" &
+  $_NC $SOCAT_OPTIONS SYSTEM:"sleep 1; \
+echo 'HTTP/1.0 200 OK'; \
+echo 'Content-Length\: $_content_len'; \
+echo ''; \
+printf '$content';" &
   serverproc="$!"
 }
 
@@ -3062,6 +3075,7 @@ _on_before_issue() {
       _info "Standalone mode."
       if [ -z "$Le_HTTPPort" ]; then
         Le_HTTPPort=80
+        _cleardomainconf "Le_HTTPPort"
       else
         _savedomainconf "Le_HTTPPort" "$Le_HTTPPort"
       fi
@@ -3269,7 +3283,7 @@ _regAccount() {
   fi
 
   _debug2 responseHeaders "$responseHeaders"
-  _accUri="$(echo "$responseHeaders" | grep "^Location:" | _head_n 1 | cut -d ' ' -f 2 | tr -d "\r\n")"
+  _accUri="$(echo "$responseHeaders" | grep -i "^Location:" | _head_n 1 | cut -d ' ' -f 2 | tr -d "\r\n")"
   _debug "_accUri" "$_accUri"
   if [ -z "$_accUri" ]; then
     _err "Can not find account id url."
@@ -3435,7 +3449,7 @@ __trigger_validation() {
   _t_vtype="$3"
   _debug2 _t_vtype "$_t_vtype"
   if [ "$ACME_VERSION" = "2" ]; then
-    _send_signed_request "$_t_url" "{\"keyAuthorization\": \"$_t_key_authz\"}"
+    _send_signed_request "$_t_url" "{}"
   else
     _send_signed_request "$_t_url" "{\"resource\": \"challenge\", \"type\": \"$_t_vtype\", \"keyAuthorization\": \"$_t_key_authz\"}"
   fi
@@ -4205,20 +4219,66 @@ $_authorizations_map"
   der="$(_getfile "${CSR_PATH}" "${BEGIN_CSR}" "${END_CSR}" | tr -d "\r\n" | _url_replace)"
 
   if [ "$ACME_VERSION" = "2" ]; then
+    _info "Lets finalize the order, Le_OrderFinalize: $Le_OrderFinalize"
     if ! _send_signed_request "${Le_OrderFinalize}" "{\"csr\": \"$der\"}"; then
       _err "Sign failed."
       _on_issue_err "$_post_hook"
       return 1
     fi
     if [ "$code" != "200" ]; then
-      _err "Sign failed, code is not 200."
+      _err "Sign failed, finalize code is not 200."
       _err "$response"
       _on_issue_err "$_post_hook"
       return 1
     fi
-    Le_LinkCert="$(echo "$response" | tr -d '\r\n' | _egrep_o '"certificate" *: *"[^"]*"' | cut -d '"' -f 4)"
+    Le_LinkOrder="$(echo "$responseHeaders" | grep -i '^Location.*$' | _tail_n 1 | tr -d "\r\n" | cut -d " " -f 2)"
+    if [ -z "$Le_LinkOrder" ]; then
+      _err "Sign error, can not get order link location header"
+      _err "responseHeaders" "$responseHeaders"
+      _on_issue_err "$_post_hook"
+      return 1
+    fi
+    _savedomainconf "Le_LinkOrder" "$Le_LinkOrder"
 
-    _tempSignedResponse="$response"
+    _link_cert_retry=0
+    _MAX_CERT_RETRY=5
+    while [ -z "$Le_LinkCert" ] && [ "$_link_cert_retry" -lt "$_MAX_CERT_RETRY" ]; do
+      if _contains "$response" "\"status\":\"valid\""; then
+        _debug "Order status is valid."
+        Le_LinkCert="$(echo "$response" | tr -d '\r\n' | _egrep_o '"certificate" *: *"[^"]*"' | cut -d '"' -f 4)"
+        _debug Le_LinkCert "$Le_LinkCert"
+        if [ -z "$Le_LinkCert" ]; then
+          _err "Sign error, can not find Le_LinkCert"
+          _err "$response"
+          _on_issue_err "$_post_hook"
+          return 1
+        fi
+        break
+      elif _contains "$response" "\"processing\""; then
+        _info "Order status is processing, lets sleep and retry."
+        _sleep 2
+      else
+        _err "Sign error, wrong status"
+        _err "$response"
+        _on_issue_err "$_post_hook"
+        return 1
+      fi
+      if ! _send_signed_request "$Le_LinkOrder"; then
+        _err "Sign failed, can not post to Le_LinkOrder cert:$Le_LinkOrder."
+        _err "$response"
+        _on_issue_err "$_post_hook"
+        return 1
+      fi
+      _link_cert_retry="$(_math $_link_cert_retry + 1)"
+    done
+
+    if [ -z "$Le_LinkCert" ]; then
+      _err "Sign failed, can not get Le_LinkCert, retry time limit."
+      _err "$response"
+      _on_issue_err "$_post_hook"
+      return 1
+    fi
+    _info "Download cert, Le_LinkCert: $Le_LinkCert"
     if ! _send_signed_request "$Le_LinkCert"; then
       _err "Sign failed, can not download cert:$Le_LinkCert."
       _err "$response"
@@ -4237,7 +4297,7 @@ $_authorizations_map"
       _end_n="$(_math $_end_n + 1)"
       sed -n "${_end_n},9999p" "$CERT_FULLCHAIN_PATH" >"$CA_CERT_PATH"
     fi
-    response="$_tempSignedResponse"
+
   else
     if ! _send_signed_request "${ACME_NEW_ORDER}" "{\"resource\": \"$ACME_NEW_ORDER_RES\", \"csr\": \"$der\"}" "needbase64"; then
       _err "Sign failed. $response"