阿里签名中URLEncode于C#URLEncod不同之处

问题

如上图所示,阿里云的PercentEncode 转换! 为 %21

PercentEncode 源码为:

package com.aliyuncs.auth;
 
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
 
public class AcsURLEncoder {
    public final static String URL_ENCODING = "UTF-8";
     
    public static String encode(String value) throws UnsupportedEncodingException {
        return URLEncoder.encode(value, URL_ENCODING);
    }
     
    public static String percentEncode(String value) throws UnsupportedEncodingException{
        return value != null ? URLEncoder.encode(value, URL_ENCODING).replace("+", "%20")
                .replace("*", "%2A").replace("%7E", "~") : null;
    }
}

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第三方工具

<a href="http://images2015.cnblogs.com/blog/684558/201701/684558-20170106162851378-1970650580.png"><img style="background-image: none; padding-top: 0; padding-left: 0; display: inline; padding-right: 0; border-width: 0" title="QQ截图20170106160805" src="https://images2015.cnblogs.com/blog/684558/201701/684558-20170106162852784-188184266.png" alt="QQ截图20170106160805" width="644" height="170" border="0"></a>

上图表明的确没有转义！（感叹号）

C#中的URLEncode转义

C#中URLEncode，C#中有两种URLEncode，WebUlitity 和 HttpUlitity

[TestFixture]
public class TestUlities
 {
     [Test]
     public void Test()
     {
         var url = @"http://img05.taobaocdn.com/bao/uploaded/TB2BVKlfFXXXXarXXXXXXXXXXXX_!!111708970-0-saturn_solar.jpg";
 
         var webUrlEncode = WebUtility.UrlEncode(url);
 
         var httpUrlEncode = HttpUtility.UrlEncode(url);
     }
 }

发现都没有转义！（感叹号）

WHY

In general URIs as defined by RFC 3986 (see Section 2: Characters) may contain any of the following characters:
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;=`.
Any other character needs to be encoded with the percent-encoding (%hh). Each part of the URI has further restrictions about what characters need to be represented by an percent-encoded word.

解决

使用以下代码URLEncode 来进行URLEncode

public class AliUrlEncodeHelper
  {
      public static string Encode(string str)
      {
          return !string.IsNullOrEmpty(str) ?
              WebUtility.UrlEncode(str).Replace("+", "%20")
              .Replace("*", "%2A")
              .Replace("%7E", "~")
              .Replace("!", "%21")
              .Replace("'","%27")
              .Replace("(", "%28") 
              .Replace(")", "%29") 
              :str;
      }
  }