C# HTTP系列3 HttpWebRequest.ContentType屬性
- 2019 年 10 月 4 日
- 筆記
獲取或設置請求的 Content-type HTTP 標頭的值。默認值為null。
常見的請求內容類型為以下幾種：
1 /// <summary> 2 /// HTTP 內容類型(Content-Type) 3 /// </summary> 4 public class HttpContentType 5 { 6 /// <summary> 7 /// 資源類型：普通文本 8 /// </summary> 9 public const string TEXT_PLAIN = "text/plain"; 10 11 /// <summary> 12 /// 資源類型：JSON字元串 13 /// </summary> 14 public const string APPLICATION_JSON = "application/json"; 15 16 /// <summary> 17 /// 資源類型：未知類型(數據流) 18 /// </summary> 19 public const string APPLICATION_OCTET_STREAM = "application/octet-stream"; 20 21 /// <summary> 22 /// 資源類型：表單數據(鍵值對) 23 /// </summary> 24 public const string WWW_FORM_URLENCODED = "application/x-www-form-urlencoded"; 25 26 /// <summary> 27 /// 資源類型：表單數據(鍵值對)。編碼方式為 gb2312 28 /// </summary> 29 public const string WWW_FORM_URLENCODED_GB2312 = "application/x-www-form-urlencoded;charset=gb2312"; 30 31 /// <summary> 32 /// 資源類型：表單數據(鍵值對)。編碼方式為 utf-8 33 /// </summary> 34 public const string WWW_FORM_URLENCODED_UTF8 = "application/x-www-form-urlencoded;charset=utf-8"; 35 36 /// <summary> 37 /// 資源類型：多分部數據 38 /// </summary> 39 public const string MULTIPART_FORM_DATA = "multipart/form-data"; 40 }
提交的時候可以說明編碼的方式，用來使對方伺服器能夠正確的解析。
該ContentType的屬性包含請求的媒體類型。分配給ContentType屬性的值在請求發送Content-typeHTTP標頭時替換任何現有內容。
要清除Content-typeHTTP標頭，請將ContentType屬性設置為null。
此屬性的值存儲在WebHeaderCollection中。如果設置了WebHeaderCollection，則屬性值將丟失。
參考示例程式碼：
1 private HttpResult Request(string url, string data, string method, string contentType) 2 { 3 HttpResult httpResult = new HttpResult(); 4 HttpWebRequest httpWebRequest = null; 5 6 try 7 { 8 httpWebRequest = WebRequest.Create(url) as HttpWebRequest; 9 httpWebRequest.Method = method; 10 httpWebRequest.Headers = HeaderCollection; 11 httpWebRequest.CookieContainer = CookieContainer; 12 /*此屬性的值存儲在WebHeaderCollection中。如果設置了WebHeaderCollection，則屬性值將丟失。 13 *所以放置在Headers 屬性之後設置 14 */ 15 httpWebRequest.ContentType = contentType; 16 httpWebRequest.UserAgent = _userAgent; 17 httpWebRequest.AllowAutoRedirect = _allowAutoRedirect; 18 httpWebRequest.ServicePoint.Expect100Continue = false; 19 20 if (data != null) 21 { 22 httpWebRequest.AllowWriteStreamBuffering = true; 23 using (Stream requestStream = httpWebRequest.GetRequestStream()) 24 { 25 requestStream.Write(EncodingType.GetBytes(data), 0, data.Length); 26 requestStream.Flush(); 27 } 28 } 29 30 HttpWebResponse httpWebResponse = httpWebRequest.GetResponse() as HttpWebResponse; 31 if (httpWebResponse != null) 32 { 33 GetResponse(ref httpResult, httpWebResponse); 34 httpWebResponse.Close(); 35 } 36 } 37 catch (WebException webException) 38 { 39 GetWebExceptionResponse(ref httpResult, webException); 40 } 41 catch (Exception ex) 42 { 43 GetExceptionResponse(ref httpResult, ex, method, contentType); 44 } 45 finally 46 { 47 if (httpWebRequest != null) 48 { 49 httpWebRequest.Abort(); 50 } 51 } 52 53 return httpResult; 54 }
