指定构成 HTTP 标头的名称/值对的集合。
Headers 集合包含与请求关联的协议标头。下表列出了由系统或由属性或方法设置但未存储在 Headers 中的 HTTP 标头。
|
标头 |
设置方 |
|---|---|
|
Accept |
由 Accept 属性设置。 |
|
Connection |
由 Connection 属性和 KeepAlive 属性设置。 |
|
Content-Length |
由 ContentLength 属性设置。 |
|
Content-Type |
由 ContentType 属性设置。 |
|
Expect |
由 Expect 属性设置。 |
|
Date |
由系统设置为当前日期。 |
|
Host |
由系统设置为当前主机信息。 |
|
If-Modified-Since |
由 IfModifiedSince 属性设置。 |
|
Range |
由 AddRange 方法设置。 |
|
Referer |
由 Referer 属性设置。 |
|
Transfer-Encoding |
由 TransferEncoding 属性设置（SendChunked 属性必须为 true）。 |
|
User-Agent |
由 UserAgent 属性设置。 |
如果您试图设置这些受保护的标头之一，则 Add 方法将引发 ArgumentException。
在通过调用 GetRequestStream、BeginGetRequestStream、GetResponse 或 BeginGetResponse 方法启动请求之后，更改 Headers 属性将引发 InvalidOperationException。
不应该假设标头值会保持不变，因为 Web 服务器和缓存可能会更改标头或向 Web 请求添加标头。
- // Create a new 'HttpWebRequest' Object to the mentioned URL.
- HttpWebRequest myHttpWebRequest=(HttpWebRequest)WebRequest.Create("http://www.contoso.com");
- // Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
- HttpWebResponse myHttpWebResponse=(HttpWebResponse)myHttpWebRequest.GetResponse();
- Console.WriteLine("/nThe HttpHeaders are /n/n/tName/t/tValue/n{0}",myHttpWebRequest.Headers);
- // Print the HTML contents of the page to the console.
- Stream streamResponse=myHttpWebResponse.GetResponseStream();
- StreamReader streamRead = new StreamReader( streamResponse );
- Char[] readBuff = new Char[256];
- int count = streamRead.Read( readBuff, 0, 256 );
- Console.WriteLine("/nThe HTML contents of page the are : /n/n ");
- while (count > 0)
- {
- String outputData = new String(readBuff, 0, count);
- Console.Write(outputData);
- count = streamRead.Read(readBuff, 0, 256);
- }
- // Close the Stream object.
- streamResponse.Close();
- streamRead.Close();
- // Release the HttpWebResponse Resource.
- myHttpWebResponse.Close();
版权声明：本文为博主原创文章，未经博主允许不得转载。
场景是 winform程序通过HttpWebRequest 调用web Api 接口
其中参数没传过去，有做过这东西的，给点建议。
下面贴代码；
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/// <summary> /// 创建POST方式的HTTP请求 /// </summary> /// <param name="url">请求的URL</param> /// <param name="parameters">随同请求POST的参数名称及参数值字典</param> /// <param name="timeout">请求的超时时间</param> /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param> /// <param name="requestEncoding">发送HTTP请求时所用的编码</param> /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param> /// <returns></returns> public static HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies) { if (string.IsNullOrEmpty(url)) { throw new ArgumentNullException("url"); } if (requestEncoding == null) { throw new ArgumentNullException("requestEncoding"); } HttpWebRequest request = null; //如果是发送HTTPS请求 if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase)) { ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); request = WebRequest.Create(url) as HttpWebRequest; request.ProtocolVersion = HttpVersion.Version10; } else { request = WebRequest.Create(url) as HttpWebRequest; } request.Method = "POST"; request.Headers.Add("X_REG_CODE", "288a633ccc1"); request.Headers.Add("X_MACHINE_ID", "a306b7c51254cfc5e22c7ac0702cdf87"); request.Headers.Add("X_REG_SECRET", "de308301cf381bd4a37a184854035475d4c64946"); request.Headers.Add("X_STORE", "0001"); request.Headers.Add("X_BAY", "0001-01"); request.Headers.Add("X-Requested-With", "XMLHttpRequest"); request.ContentType = "application/x-www-form-urlencoded"; request.Headers.Add("Accept-Language", "zh-CN"); request.Headers.Add("Accept-Encoding", "gzip, deflate"); request.Accept = "*/*"; if (!string.IsNullOrEmpty(userAgent)) { request.UserAgent = userAgent; } else { request.UserAgent = DefaultUserAgent; } if (timeout.HasValue) { request.Timeout = timeout.Value; } // if (cookies != null) // { request.CookieContainer = new CookieContainer(); // request.CookieContainer.Add(cookies); // } //如果需要POST数据 if (!(parameters == null || parameters.Count == 0)) { StringBuilder buffer = new StringBuilder(); int i = 0; foreach (string key in parameters.Keys) { if (i > 0) { buffer.AppendFormat("&{0}={1}", key, parameters[key]); } else { buffer.AppendFormat("{0}={1}", key, parameters[key]); } i++; } byte[] data = requestEncoding.GetBytes(buffer.ToString()); using (Stream stream = request.GetRequestStream()) { stream.Write(data, 0, data.Length); } } HttpWebResponse res; try { res = (HttpWebResponse)request.GetResponse(); } catch (WebException ex) { res = (HttpWebResponse)ex.Response; } return res; } |
下面是调用代码
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public string GetCookies() { string url = "http://localhost:17766/Account/LogOn"; IDictionary<string, string> parameters = new Dictionary<string, string>(); parameters.Add("StoreCode", "0001"); parameters.Add("UserName", "T00000"); parameters.Add("Password", "123456"); //string postData = "StoreCode=0001&UserName=T00000&Password=123456"; //HttpWebResponseUtility.PostData(postData, url, null); Encoding encoding = Encoding.GetEncoding("gb2312"); HttpWebResponse response = HttpWebResponseUtility.CreatePostHttpResponse(url, parameters, null, null, encoding, null); String xml = new StreamReader(response.GetResponseStream(), Encoding.UTF8).ReadToEnd(); return xml; } |