[英]c# HTTP 400 error (Bad Request) thrown by HttpWebRequest (intermitent)
[英]C# HttpWebRequest / Response gives 400 Bad Request. But not with Firefox HTTP Resource Test
我需要使用xml数据发出POST请求。
String xml = "";
byte[] data = System.Text.Encoding.UTF8.GetBytes(xml);
HttpClient.post(url, data, "text/xml")
然后我调用POST函数:
public static String post(String url, byte[] data, String contentType){
String body = "";
body = getResponse("POST", url, data, contentType, 80);
return body;
}
现在,我调用此函数进行请求/获取响应:
public static String getResponse(String method, String url, byte[] data, String contentType, int serverPort)
{
String result = null;
HttpWebRequest request = sendRequest(method, url, data, contentType, serverPort);
HttpWebResponse response = null;
try
{
response = (HttpWebResponse)request.GetResponse();
if (response != null){
// Get the stream associated with the response
Stream receiveStream = response.GetResponseStream ();
// Pipes the stream to a higher level stream reader
StreamReader readStream = new StreamReader (receiveStream, System.Text.Encoding.UTF8);
result = readStream.ReadToEnd ();
}
}
catch(WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError){
throw new HttpClientException("HTTP response error. ", (int)(((HttpWebResponse)ex.Response).StatusCode), ((HttpWebResponse)ex.Response).StatusDescription);
}
else{
throw new HttpClientException("HTTP response error with status: " + ex.Status.ToString());
}
}
}
和
public static HttpWebRequest sendRequest(String method, String url, byte[] data, String contentType, int serverPort){
HttpWebRequest request = null;
try
{
UriBuilder requestUri = new UriBuilder(url);
requestUri.Port = serverPort;
request = (HttpWebRequest)WebRequest.Create(requestUri.Uri);
request.Method = method;
//
if ((method == "POST") && (data != null) && (data.Length > 0)){
request.ContentLength = data.Length;
request.ContentType = ((String.IsNullOrEmpty(contentType))?"application/x-www-form-urlencoded":contentType);
Stream dataStream = request.GetRequestStream ();
dataStream.Write (data, 0, data.Length);
// Close the Stream object.
dataStream.Close ();
}
}
catch(WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError){
throw new HttpClientException("HTTP request error. ", (int)(((HttpWebResponse)ex.Response).StatusCode), ((HttpWebResponse)ex.Response).StatusDescription);
}
else{
throw new HttpClientException("HTTP request error with status: " + ex.Status.ToString());
}
}
}
它总是给我一个HttpCliendException
:
video_api.HttpClientException: HttpClient exception :HTTP response error. with `code: 400` and `status: Bad Request`
但是,当我使用Firefox插件HTTP Resource Test
尝试时,它运行良好并且使用相同的XML文档获得202 Accepted status
。
在调用发布请求之前,我先控制台了content-type和data.length,content-type是text / xml, data.length
是143
。
使用fiddler(http://www.fiddler2.com/fiddler2/)可以准确查看Firefox发送的标头。 然后查看您发送的标头中有什么不同。
我知道有些网站对请求标头很挑剔,仅根据这些值返回不同的结果。 比较FireFox中的HTTP请求的请求标头和您的请求,如果模仿FireFox资源测试中的标头,则它很可能起作用( Request.AddHeader("name", "value")
)。 要注意的另一个区别可能是用户代理,它对于Web服务器仍然很挑剔。
在我的项目中,我在config.area中使用一些自定义设置
<defaultProxy useDefaultCredentials="true">
...
</defaultProxy>
它帮助我禁用了代理:
request.Proxy = null;
另一种解决方案是将SSL和NON-SSL端口弄乱。
当您将纯HTTP与https端口对话时,在Apache上回答400错误请求。
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