diff --git a/README.md b/README.md
index 5a0b4c1..b7b42df 100644
--- a/README.md
+++ b/README.md
@@ -33,13 +33,30 @@ Pingpp.api_key = "YOUR-KEY"
 Pingpp.private_key_path = '/path/to/your_rsa_private_key.pem'
 ```
 
-### 设置 Ping++ 公钥
-公钥请登录 [Ping++ Dashboard](https://dashboard.pingxx.com) 获取  
+### 验证 Webhooks
+
+#### 设置 Ping++ 公钥
+
+公钥请登录 [Ping++ Dashboard](https://dashboard.pingxx.com) 获取。
+
+此公钥用于webhooks回调时，验证请求对象的正确性。
+
 设置你的 Ping++ 公钥路径
+
 ``` ruby
 Pingpp.pub_key_path = "/path/to/pingpp_rsa_public_key.pem"
 ```
 
+#### 验证
+
+支持基于Rack的web框架,如Rails,Sinatra等.
+```ruby
+Pingpp::Webhook.verify?(request) # 验证回调的请求对象的正确性
+# 解析回调内容
+JSON.parse(request.raw_post) # Ruby on Rails
+JSON.parse(request.body.read) # Sinatra
+```
+
 ### 支付
 ``` ruby
 Pingpp::Charge.create(
@@ -54,12 +71,6 @@ Pingpp::Charge.create(
 )
 ```
 
-### 验证 Webhooks
-```ruby
-Pingpp::Webhook.verify?(request) # 验证回调
-JSON.parse(request.raw_post) # 解析回调内容（Ruby on Rails）
-```
-
 ### 查询
 ``` ruby
 Pingpp::Charge.retrieve("CHARGE_ID")
diff --git a/lib/pingpp/webhook.rb b/lib/pingpp/webhook.rb
index d159fda..4c7b4c2 100644
--- a/lib/pingpp/webhook.rb
+++ b/lib/pingpp/webhook.rb
@@ -1,34 +1,58 @@
 module Pingpp
   module Webhook
     def self.verify?(request, pub_key=Pingpp.pub_key)
-      if !pub_key
+      unless pub_key
+        puts 'Warn: ' + 'No Public key provided. ' +
+                            'Set your Public key using "Pingpp.pub_key_path = <API-KEY-FILE> ' +
+                            'or Pingpp.pub_key = <API-KEY>" ' +
+                            'You can get Public key from the Pingpp website: ' +
+                            'https://dashboard.pingxx.com/settings/development_info '
         return false
       end
 
-      raw_data = nil
-      if request.respond_to?('raw_post')
-        raw_data = request.raw_post
-      elsif request.respond_to?('body')
-        raw_data = request.body
-      else
-        return false
-      end
+      # raw_data = nil
+      # if request.respond_to?('raw_post')
+      #   raw_data = request.raw_post
+      # elsif request.respond_to?('body')
+      #   raw_data = request.body
+      # else
+      #   return false
+      # end
 
-      headers = nil
-      if request.respond_to?('headers')
-        headers = request.headers
-      elsif request.respond_to?('header')
-        headers = request.header
-      else
-        return false
-      end
+      raw_data = extract_raw_data(request)
+
+      # headers = nil
+      # if request.respond_to?('headers')
+      #   headers = request.headers
+      # elsif request.respond_to?('header')
+      #   headers = request.header
+      # else
+      #   return false
+      # end
+
+      headers = extract_headers(request)
 
-      formated_headers = Util.format_headers(headers)
-      return false if !formated_headers.has_key?(:x_pingplusplus_signature)
+      formatted_headers = Util.format_headers(headers)
+      return false unless formatted_headers.has_key?(:x_pingplusplus_signature)
+
+      signature = formatted_headers[:x_pingplusplus_signature]
 
-      signature = formated_headers[:x_pingplusplus_signature]
       rsa_public_key = OpenSSL::PKey.read(pub_key)
-      return rsa_public_key.verify(OpenSSL::Digest::SHA256.new, Base64.decode64(signature), raw_data)
+      rsa_public_key.verify(OpenSSL::Digest::SHA256.new, Base64.decode64(signature), raw_data)
+    end
+
+    # A dumbed down version extracted from ActionDispatch::Request#raw_post
+    # see actionpack-4.2.7.1/lib/action_dispatch/http/request.rb#251
+    def self.extract_raw_data(request)
+      body = request.env['rack.input']
+      raw_post_body = body.read(request.content_length.to_i)
+      body.rewind if body.respond_to?(:rewind)
+      raw_post_body
+    end
+
+    # see actionpack-4.2.7.1/lib/action_dispatch/http/headers.rb#each
+    def self.extract_headers(request)
+      request.env
     end
   end
 end