diff --git a/README.md b/README.md
index bfcb477..5471c57 100644
--- a/README.md
+++ b/README.md
@@ -220,22 +220,7 @@ acme.sh --issue --standalone -d example.com -d www.example.com -d cp.example.com
 More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
 
 
-# 5. Use Standalone TLS server to issue cert
-
-**(requires you to be root/sudoer or have permission to listen on port 443 (TCP))**
-
-acme.sh supports `tls-sni-01` validation.
-
-Port `443` (TCP) **MUST** be free to listen on, otherwise you will be prompted to free it and try again.
-
-```bash
-acme.sh --issue --tls -d example.com -d www.example.com -d cp.example.com
-```
-
-More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
-
-
-# 6. Use Apache mode
+# 5. Use Apache mode
 
 **(requires you to be root/sudoer, since it is required to interact with Apache server)**
 
@@ -255,7 +240,7 @@ We don't want to mess your apache server, don't worry.**
 
 More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
 
-# 7. Use Nginx mode
+# 6. Use Nginx mode
 
 **(requires you to be root/sudoer, since it is required to interact with Nginx server)**
 
@@ -279,7 +264,7 @@ We don't want to mess your nginx server, don't worry.**
 
 More examples: https://github.com/Neilpang/acme.sh/wiki/How-to-issue-a-cert
 
-# 8. Automatic DNS API integration
+# 7. Automatic DNS API integration
 
 If your DNS provider supports API access, we can use that API to automatically issue the certs.
 
@@ -342,7 +327,7 @@ If your DNS provider is not on the supported list above, you can write your own
 
 For more details: [How to use DNS API](dnsapi)
 
-# 9. Use DNS manual mode:
+# 8. Use DNS manual mode:
 
 If your dns provider doesn't support any api access, you can add the txt record by your hand.
 
@@ -376,7 +361,7 @@ Ok, it's done.
 
 **Please use dns api mode instead.**
 
-# 10. Issue ECC certificates
+# 9. Issue ECC certificates
 
 `Let's Encrypt` can now issue **ECDSA** certificates.
 
@@ -408,7 +393,7 @@ Valid values are:
 
 
 
-# 11. Issue Wildcard certificates
+# 10. Issue Wildcard certificates
 
 It's simple, just give a wildcard domain as the `-d` parameter.
 
@@ -418,7 +403,7 @@ acme.sh  --issue -d example.com  -d *.example.com  --dns dns_cf
 
 
 
-# 12. How to renew the certs
+# 11. How to renew the certs
 
 No, you don't need to renew the certs manually. All the certs will be renewed automatically every **60** days.
 
@@ -435,7 +420,7 @@ acme.sh --renew -d example.com --force --ecc
 ```
 
 
-# 13. How to stop cert renewal
+# 12. How to stop cert renewal
 
 To stop renewal of a cert, you can execute the following to remove the cert from the renewal list:
 
@@ -448,7 +433,7 @@ The cert/key file is not removed from the disk.
 You can remove the respective directory (e.g. `~/.acme.sh/example.com`) by yourself.
 
 
-# 14. How to upgrade `acme.sh`
+# 13. How to upgrade `acme.sh`
 
 acme.sh is in constant development, so it's strongly recommended to use the latest code.
 
@@ -473,25 +458,25 @@ acme.sh --upgrade --auto-upgrade 0
 ```
 
 
-# 15. Issue a cert from an existing CSR
+# 14. Issue a cert from an existing CSR
 
 https://github.com/Neilpang/acme.sh/wiki/Issue-a-cert-from-existing-CSR
 
 
-# 16. Under the Hood
+# 15. Under the Hood
 
 Speak ACME language using shell, directly to "Let's Encrypt".
 
 TODO:
 
 
-# 17. Acknowledgments
+# 16. Acknowledgments
 
 1. Acme-tiny: https://github.com/diafygi/acme-tiny
 2. ACME protocol: https://github.com/ietf-wg-acme/acme
 
 
-# 18. License & Others
+# 17. License & Others
 
 License is GPLv3
 
@@ -500,7 +485,7 @@ Please Star and Fork me.
 [Issues](https://github.com/Neilpang/acme.sh/issues) and [pull requests](https://github.com/Neilpang/acme.sh/pulls) are welcome.
 
 
-# 19. Donate
+# 18. Donate
 Your donation makes **acme.sh** better:
 
 1. PayPal/Alipay(支付宝)/Wechat(微信): [https://donate.acme.sh/](https://donate.acme.sh/)
diff --git a/acme.sh b/acme.sh
index 5d9b63c..e7c40c0 100755
--- a/acme.sh
+++ b/acme.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-VER=2.7.7
+VER=2.7.8
 
 PROJECT_NAME="acme.sh"
 
@@ -47,6 +47,7 @@ DEFAULT_DNS_SLEEP=120
 NO_VALUE="no"
 
 W_TLS="tls"
+W_DNS="dns"
 DNS_ALIAS_PREFIX="="
 
 MODE_STATELESS="stateless"
@@ -2341,7 +2342,7 @@ _initpath() {
     fi
   fi
 
-  _debug2 ACME_DIRECTORY "$ACME_DIRECTORY"
+  _debug ACME_DIRECTORY "$ACME_DIRECTORY"
   _ACME_SERVER_HOST="$(echo "$ACME_DIRECTORY" | cut -d : -f 2 | tr -s / | cut -d / -f 2)"
   _debug2 "_ACME_SERVER_HOST" "$_ACME_SERVER_HOST"
 
@@ -2998,6 +2999,8 @@ _on_before_issue() {
   _chk_pre_hook="$4"
   _chk_local_addr="$5"
   _debug _on_before_issue
+  _debug _chk_main_domain "$_chk_main_domain"
+  _debug _chk_alt_domains "$_chk_alt_domains"
   #run pre hook
   if [ "$_chk_pre_hook" ]; then
     _info "Run pre hook:'$_chk_pre_hook'"
@@ -3018,11 +3021,17 @@ _on_before_issue() {
 
   _debug Le_LocalAddress "$_chk_local_addr"
 
-  alldomains=$(echo "$_chk_main_domain,$_chk_alt_domains" | tr ',' ' ')
   _index=1
   _currentRoot=""
   _addrIndex=1
-  for d in $alldomains; do
+  _w_index=1
+  while true; do
+    d="$(echo "$_chk_main_domain,$_chk_alt_domains," | cut -d , -f "$_w_index")"
+    _w_index="$(_math "$_w_index" + 1)"
+    _debug d "$d"
+    if [ -z "$d" ]; then
+      break
+    fi
     _debug "Check for domain" "$d"
     _currentRoot="$(_getfield "$_chk_web_roots" $_index)"
     _debug "_currentRoot" "$_currentRoot"
@@ -3118,7 +3127,7 @@ _on_issue_err() {
     )
   fi
 
-  if [ "$IS_RENEW" = "1" ] && _hasfield "$Le_Webroot" "dns"; then
+  if [ "$IS_RENEW" = "1" ] && _hasfield "$Le_Webroot" "$W_DNS"; then
     _err "$_DNS_MANUAL_ERR"
   fi
 
@@ -3154,7 +3163,7 @@ _on_issue_success() {
     fi
   fi
 
-  if _hasfield "$Le_Webroot" "dns"; then
+  if _hasfield "$Le_Webroot" "$W_DNS"; then
     _err "$_DNS_MANUAL_WARN"
   fi
 
@@ -3421,6 +3430,9 @@ issue() {
     _main_domain=$(echo "$2,$3" | cut -d , -f 1)
     _alt_domains=$(echo "$2,$3" | cut -d , -f 2- | sed "s/,${NO_VALUE}$//")
   fi
+  _debug _main_domain "$_main_domain"
+  _debug _alt_domains "$_alt_domains"
+
   _key_length="$4"
   _real_cert="$5"
   _real_key="$6"
@@ -3551,10 +3563,15 @@ issue() {
     if [ "$ACME_VERSION" = "2" ]; then
       #make new order request
       _identifiers="{\"type\":\"dns\",\"value\":\"$_main_domain\"}"
-      for d in $(echo "$_alt_domains" | tr ',' ' '); do
-        if [ "$d" ]; then
-          _identifiers="$_identifiers,{\"type\":\"dns\",\"value\":\"$d\"}"
+      _w_index=1
+      while true; do
+        d="$(echo "$_alt_domains," | cut -d , -f "$_w_index")"
+        _w_index="$(_math "$_w_index" + 1)"
+        _debug d "$d"
+        if [ -z "$d" ]; then
+          break
         fi
+        _identifiers="$_identifiers,{\"type\":\"dns\",\"value\":\"$d\"}"
       done
       _debug2 _identifiers "$_identifiers"
       if ! _send_signed_request "$ACME_NEW_ORDER" "{\"identifiers\": [$_identifiers]}"; then
@@ -3591,6 +3608,8 @@ issue() {
         _debug2 "_authz_url" "$_authz_url"
         if ! response="$(_get "$_authz_url")"; then
           _err "get to authz error."
+          _err "_authorizations_seg" "$_authorizations_seg"
+          _err "_authz_url" "$_authz_url"
           _clearup
           _on_issue_err "$_post_hook"
           return 1
@@ -3609,10 +3628,16 @@ $_authorizations_map"
       _debug2 _authorizations_map "$_authorizations_map"
     fi
 
-    alldomains=$(echo "$_main_domain,$_alt_domains" | tr ',' ' ')
     _index=0
     _currentRoot=""
-    for d in $alldomains; do
+    _w_index=1
+    while true; do
+      d="$(echo "$_main_domain,$_alt_domains," | cut -d , -f "$_w_index")"
+      _w_index="$(_math "$_w_index" + 1)"
+      _debug d "$d"
+      if [ -z "$d" ]; then
+        break
+      fi
       _info "Getting webroot for domain" "$d"
       _index=$(_math $_index + 1)
       _w="$(echo $_web_roots | cut -d , -f $_index)"
@@ -3624,7 +3649,7 @@ $_authorizations_map"
 
       vtype="$VTYPE_HTTP"
       #todo, v2 wildcard force to use dns
-      if _startswith "$_currentRoot" "dns"; then
+      if _startswith "$_currentRoot" "$W_DNS"; then
         vtype="$VTYPE_DNS"
       fi
 
@@ -3641,6 +3666,7 @@ $_authorizations_map"
         _debug2 "response" "$response"
         if [ -z "$response" ]; then
           _err "get to authz error."
+          _err "_authorizations_map" "$_authorizations_map"
           _clearup
           _on_issue_err "$_post_hook"
           return 1
@@ -3751,6 +3777,10 @@ $_authorizations_map"
         if [ "$d_api" ]; then
           _info "Found domain api file: $d_api"
         else
+          if [ "$_currentRoot" != "$W_DNS" ]; then
+            _err "Can not find dns api hook for: $_currentRoot"
+            _info "You need to add the txt record manually."
+          fi
           _info "$(__red "Add the following TXT record:")"
           _info "$(__red "Domain: '$(__green "$txtdomain")'")"
           _info "$(__red "TXT value: '$(__green "$txt")'")"
@@ -4264,7 +4294,7 @@ renew() {
   fi
 
   . "$DOMAIN_CONF"
-
+  _debug Le_API "$Le_API"
   if [ "$Le_API" ]; then
     if [ "$_OLD_CA_HOST" = "$Le_API" ]; then
       export Le_API="$DEFAULT_CA"
@@ -4868,6 +4898,8 @@ _deactivate() {
     _debug2 "authzUri" "$authzUri"
     if ! response="$(_get "$authzUri")"; then
       _err "get to authz error."
+      _err "_authorizations_seg" "$_authorizations_seg"
+      _err "authzUri" "$authzUri"
       _clearup
       _on_issue_err "$_post_hook"
       return 1
@@ -5779,7 +5811,7 @@ _process() {
         fi
         ;;
       --dns)
-        wvalue="dns"
+        wvalue="$W_DNS"
         if [ "$2" ] && ! _startswith "$2" "-"; then
           wvalue="$2"
           shift