system.net.webexception

问题 I have this code: public class WebDataDownloader { public string GetJSONFromURL(string url) { string file = string.empty; //*********get the json file using httpRequest *********** try { HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url); httpWebRequest.Method = WebRequestMethods.Http.Get; httpWebRequest.Accept = "application/json; charset=utf-8"; //httpWebRequest.UserAgent = @"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0

问题 I have this code: public class WebDataDownloader { public string GetJSONFromURL(string url) { string file = string.empty; //*********get the json file using httpRequest *********** try { HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url); httpWebRequest.Method = WebRequestMethods.Http.Get; httpWebRequest.Accept = "application/json; charset=utf-8"; //httpWebRequest.UserAgent = @"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0

问题 I've hunted around for some definitive documentation on this but haven't had much luck finding any. For which HTTP Response Status codes will HttpWebRequest.GetResponse() generate a WebException after doing something like a POST? Specifically, will it generate a WebException for anything other than status 200 OK ? Or will it only generate a WebException for say, 400, 404, and 500 (for the sake of argument)? I want to know since the server I'm communicating with defines anything other than

问题 I am trying to use a WebClient / HttpWebRequest to download some data from a server. I use the following code to do so: WebClient client = new WebClient(); client.Credentials = new NetworkCredential("admin", "password"); Stream datastream = client.OpenRead("http://routerlogin.com/cgi-bin/CF_logs.html"); StreamReader reader = new StreamReader(datastream); The server is my page is in my router's configuration. It works fine from a browser, but when downloaded using my code it throws a

问题 I have the following snippet in classic ASP, to send a command and retrieve the response over SSL: Dim xmlHTTP Set xmlHTTP = Server.CreateObject("Msxml2.ServerXMLHTTP.3.0") xmlHTTP.open "POST", "https://www.example.com", False xmlHTTP.setRequestHeader "Content-Type","application/x-www-form-urlencoded" xmlHTTP.setRequestHeader "Content-Length", Len(postData) xmlHTTP.Send postData If xmlHTTP.status = 200 And Len(message) > 0 And Not Err Then Print xmlHTTP.responseText End If Then I used this

问题 I'm getting this error on just one server running Windows Server 2003: System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send. Here's my code... Any ideas? HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https:// URL HERE "); //request.Headers.Add("Accept", "application/xml"); byte[] bytes; bytes = System.Text.Encoding.ASCII.GetBytes(xml); request.KeepAlive = false; request.Accept = "application/xml"; request.ContentType =

问题 Can someone help clear up the usage of the "StatusCode" property in HttpWebResponse and WebException? For example it seems that if: a) there is no exception, then the HttpWebResponse will have a StatusCode that could have some values that indicate both: - success (e.g. OK, Accepted etc) - failure (e.g. UseProxy, RequestTimeout etc) b) there is a WebExeption throw, which itself has a response object that again has a StatusCode (which I assume is based on the same HttpStatusCode Enumeration.

问题 In response to another question on stackoverflow RavenDB does not play nicely with Transaction Scope i have created a test case where i isolate my transactions for storing and reading. In my test case i am making a call to a raven document store and a mssql database within the same transaction. But i get a Web Exception. Any ideas why or how to solve it. Below is my code private static string con = "Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=TestDB;Data Source=.";

问题 Hello I'm trying to fetch data from a https web (i'm not behind firewall or proxy) however even accepting all certificates it keeps throwing System.Net.WebExceptionStatus.SecureChannelFailure with the message shown: Cancelled the request: Unable to create a secure SSL/TLS channel ... i've looked everywhere so you guys are my last chance. static void Main(string[] args) { RemoteCertificateValidationCallback ServerCertificateValidationCallback = delegate { return true; }; HttpWebRequest request

问题 I am using paypal NVP api in an ecommerce website. It was working fine before but now it is throwing "System.Net.WebException: The remote name could not be resolved: 'api-3t.sandbox.paypal.com'" Exception. I also tried api.sandbox.paypal.com but no luck. Any ideas? Thanks Update : Same codes works if my client runs it from his system. 回答1: This is a DNS problem, or at least, that's what the exception points to. The machine that is running your code, and failing, is not able to resolve the