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目录

1.问题描述

2.解决思路

3.解决步骤

1.问题描述

使用POST方法调用上级网络公司接口，返回HTTP状态码415，信息为Content type application/x-www-form-urlencoded not supported。

2. 解决思路检查接口文档，确认是否支持application/x-www-form-urlencoded内容类型。如果支持，检查请求格式是否正确；如果不支持，考虑使用支持的格式。

3. 解决步骤

1.问题描述

使用POST方法调用上级网络公司接口，返回HTTP状态码415，信息为Content type application/x-www-form-urlencoded not supported。

目录

• 1.问题描述
• 2.解决思路
• 3.解决步骤

1.问题描述

使用post方法调用上级联网厂家接口，返回www.getpostman.com/downloads/

使用application/x-www-form-urlencoded调用接口，返回112.17.158.12:8180/intf/services/query"; HttpWebRequest request = WebRequest.Create(new Uri(url)) as HttpWebRequest; request.Method = "POST"; request.Host = "112.17.158.12:8180"; request.ContentType = "multipart/form-data; "; request.UserAgent = "PostmanRuntime/7.17.1"; request.Accept = "*/*"; request.KeepAlive = true; string postData = @"jkuser=33088102&jkpasswd=33088102&jsondata={""jkid"":""R10"",""requestTime"":""20190919110603"",""body"":[{""inspstationcode"":""33088102""}]}"; byte[] postdatabyte = Encoding.GetEncoding("utf-8").GetBytes(postData); request.ContentLength = postdatabyte.Length; using (Stream stream = request.GetRequestStream()) { stream.Write(postdatabyte, 0, postdatabyte.Length); } HttpWebResponse response = request.GetResponse() as HttpWebResponse; using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8"))) { string temp = reader.ReadToEnd(); }

显然不对，捕获到了"远程服务器返回错误:(500)内部服务器错误。"异常，那么我们该怎么办呢？

2.解决思路

既然Postman工具使用ContentType为multipart/form-data类型post数据可以成功，那么我们写的C#程序应该也可以呀！那怎么办呢？。。。。没错！！就是抓包！

首先想到的是，用fiddler抓Postman的数据包，然后C#程序构造同样的数据包即可。

观察数据包Headers选项卡，如图：

发现Content-Type: multipart/form-data;后面跟了一个boundary=----------------------------183584948778966847113836

并且TextView选项卡如下：

WebForms选项卡如下：

所以，可以按照Headers和TextView选项卡内容构造post请求，就可以解决我们的问题了！

3.解决步骤

将ContentType加上boundary=boundary-------------------------xxxxxxxxxxxxxx

并且构造参数，如下：

string url = "112.17.158.12:8180/intf/services/query"; string boundary = "--------------------------" + DateTime.Now.Ticks.ToString("x"); string boundary2 = "--" + boundary; HttpWebRequest request = WebRequest.Create(new Uri(url)) as HttpWebRequest; request.Method = "POST"; request.Host = "112.17.158.12:8180"; request.ContentType = "multipart/form-data; boundary=" + boundary; request.UserAgent = "PostmanRuntime/7.17.1"; request.Accept = "*/*"; request.KeepAlive = true; StringBuilder sb = new StringBuilder(); sb.Append(boundary2 + "\r\n"); sb.Append(@"Content-Disposition: form-data; name=""jkuser""" + "\r\n\r\n"); sb.Append("33088102" + "\r\n"); sb.Append(boundary2 + "\r\n"); sb.Append(@"Content-Disposition: form-data; name=""jkpasswd""" + "\r\n\r\n"); sb.Append("33088102" + "\r\n"); sb.Append(boundary2 + "\r\n"); sb.Append(@"Content-Disposition: form-data; name=""jsondata""" + "\r\n\r\n"); sb.Append(@"{""jkid"":""R10"",""requestTime"":""20190919110603"",""body"":[{""inspstationcode"":""33088102""}]}" + "\r\n"); sb.Append(boundary2 + "--" + "\r\n"); string postData = sb.ToString(); byte[] postdatabyte = Encoding.GetEncoding("utf-8").GetBytes(postData); request.ContentLength = postdatabyte.Length; using (Stream stream = request.GetRequestStream()) { stream.Write(postdatabyte, 0, postdatabyte.Length); } HttpWebResponse response = request.GetResponse() as HttpWebResponse; using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8"))) { string temp = reader.ReadToEnd(); }

值得注意的是，“boundary-------------------------xxxxxxxxxxxxxx”

这么长一串东西，只是作为分隔符出现的，不必太在意它是什么东西，我将它理解为分割文本参数的这么一个东西，并且通过仔细观察发现可以发现header中contenttype的横线数量比参数中横线数量少两个且必须少两个？

以上为个人经验，希望能给大家一个参考，也希望大家多多支持自由互联。