I have some problems with code. I'm using HttpWebRequest class to do operations
Code as bellow:
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072 | (SecurityProtocolType)768;
ServicePointManager.Expect100Continue = true;
//ServicePointManager.DefaultConnectionLimit = 5;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serverName + authorizePath);
request.Abort();
byte[] bearerMatch = UTF8Encoding.UTF8.GetBytes("username:password");
//request.Proxy = null; //<TNI_20180808
request.Method = "POST";
request.Accept = "application/json";
request.ContentType = "application/json";
request.Timeout = 100;
//request.Headers["Authorization"] = "Bearer " + Convert.ToBase64String(bearerMatch);
string content = String.Format(authorizeBody, login, password);
content = "{" + content + "}";
try
{
using (var writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(content);
}
using (WebResponse response = request.GetResponse())
{
using (var reader = new StreamReader(response.GetResponseStream()))
{
var responseContent = reader.ReadToEnd();
token = responseContent.Replace('"', ' ').Trim();
}
//response.Close();
//request.Abort();
}
}
catch (Exception ex)
{
throw ex;
}
Until third operation everything is okey, unfortunately i don't know what to do. When application is trying to create request third time there is an timeout error:
at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
I think that there is an opportunity to solve this with closing request and response in a proper way but i don't know how to do this. After increasing ServicePointManager.DefaultConnectionLimit operations were getting completed correctly.
Can you help me please? How should i abort or close request/response in a good way?
Thank you!
Related
I have done a post method to consult the OneSignal API Rest, that when an order has been accepted a notification is sent to the user from the device that placed the order and this is the code line that does not work, and it worked without the small_icon, large_icon and android_accent_color
CODE:
public static void PostNotification(string idPush)
{
var request = WebRequest.Create(AppSettings.OneSignalApi) as HttpWebRequest;
request.KeepAlive = true;
request.Method = "POST";
request.ContentType = "application/json; charset=utf-8";
request.Headers.Add("authorization", AppSettings.KeyPush);
byte[] byteArray = Encoding.UTF8.GetBytes("{"
+ $"\"app_id\": \"{AppSettings.PushIDApp}\","
+ "\"small_icon\": \"ic_stat_onesignal_default\","
+ "\"large_icon\": \"ic_onesignal_large_icon_default\","
+ "\"android_accent_color\": \"FFba3870\","
+ "\"contents\": {\"en\": \"Pedido Aceptado\"},"
+ $"\"include_player_ids\": [\"{idPush}\"]" +
"}");
string responseContent = null;
try
{
using (var writer = request.GetRequestStream())
{
writer.Write(byteArray, 0, byteArray.Length);
}
using (var response = request.GetResponse() as HttpWebResponse)
{
using (var reader = new StreamReader(response.GetResponseStream()))
{
responseContent = reader.ReadToEnd();
}
}
}
catch (WebException ex)
{
System.Diagnostics.Debug.WriteLine(ex.Message);
System.Diagnostics.Debug.WriteLine(new StreamReader(ex.Response.GetResponseStream()).ReadToEnd());
}
}
I have the icons but it does not show them, it does not send me the notification with it, just removing the following 3 properties, small_icon, large_icon and android_accent_color I do not know if the way I am doing it will be wrong, and I have followed the documentation of the Create Notification.
In my C# application I have a while loop that gathers a string from a Redis message queue and sends it to a listening server.
At every cicle the connection is opened with an HttpWebRequest Post method and the data is sent using a StreamWriter variable.
Problem is: after sending two strings the application freezes without returning any error, it just does nothing for maybe a minute, after that it works again correctly and continues its job for another couple strings, freeze and so on.
Debug shows the delay happens during the declaration of the StreamWriter variable.
Here is the core of the code:
// configure Redis
var redis = new RedisClient("127.0.0.1");
while (true)
{
// read from Redis queue
string json = redis.BRPop(30, "sensors_data");
//...
//URL DECLARATION
//...
try
{
var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentLength = json.Length;
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
httpWebRequest.Proxy = null;
SendDataAsync(json, url);
}
}
static async Task SendDataAsync(string json, string url)
{
try
{
var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentLength = json.Length;
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
httpWebRequest.Proxy = null;
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
try
{
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
Console.Write("Data Sent");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
catch (Exception err)
{
Console.Write(err.Message);
}
Console.WriteLine();
}
So the code actually works, just there is some strange huge delay where it comes to declare the StreamWriter. Does anyone have any idea? I don't know how to handle the problem.
EDIT
while (true)
{
i = 0;
// read from Redis queue
string json = redis.BRPop(30, "sensors_data");
try
{
var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentLength = json.Length;
httpWebRequest.ContentType = "application/json";
httpWebRequest.Method = "POST";
httpWebRequest.Proxy = null;
using (StreamWriter streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
try
{
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
var response = httpWebRequest.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string reply=reader.ReadToEnd();
Console.WriteLine(reply);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
catch (Exception err)
{
Console.Write(err.Message);
}
Console.WriteLine();
}
Found the solution: Apparently it is necessary to get an answer from the server, after I added the httpWebRequest.GetResponse() and the following two lines I didn't find delays anymore.
Suggestion: it's better to use WebClient, it didn't give me any problem from the first try.
I am doing an API Post request and cant seem to get it to work. I always get a sendFailure webexception and the response for the exception is always null so catching the exception is useless. It keeps happening when I try to get the httpWebResponse. I noticed too the request.contentlength gave errors at postream getrequeststream so i commented it out. Test.json is the file I use for the request body. I also tested this on different API testers by including the URL, body, and content-type in the header and they worked. I just cant seem to code it for myself. The credentials work I just dont know if im doing the request correctly?
JSON File:
{
"email": "abc#123.com",
"password": "12345",
"facilityNumber": "987654"
}
string filepath = "test.json";
string result = string.Empty;
using (StreamReader r = new StreamReader(filepath))
{
var json = r.ReadToEnd();
var jobj = JObject.Parse(json);
foreach (var item in jobj.Properties())
{
item.Value = item.Value.ToString().Replace("v1", "v2");
}
result = jobj.ToString();
Console.WriteLine(result);
}
try
{
string setupParameters;
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("https://www.test.com/abcde");
request.AllowAutoRedirect = true;
setupParameters = result;
ServicePointManager.ServerCertificateValidationCallback = (s, cert, chain, ssl) => true;
ASCIIEncoding encoding = new ASCIIEncoding();
var postData = setupParameters;
request.Method = "POST";
request.ContentType = "application/json";
byte[] data = encoding.GetBytes(postData);
//request.ContentLength = data.Length;
using (StreamWriter postStream = new StreamWriter(request.GetRequestStream()))//error if uncomment contentlength
{
postStream.Write(postData);
postStream.Flush();
postStream.Close();
}
HttpWebResponse wr = (HttpWebResponse)request.GetResponse();//error occurs
Stream receiveStream = wr.GetResponseStream();
StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
}
catch (WebException ex)
{
if (ex.Response != null)
{
using (var errorResponse = (HttpWebResponse)ex.Response)
{
using (var reader = new StreamReader(errorResponse.GetResponseStream()))
{
string error = reader.ReadToEnd();
result = error;
}
}
}
I suggest modifiying your request to follow this format. Especially pay attention to the request.Method and request.ContentType which have caught me out multiple times.
Also, handling the response is easier this way.
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(YOURURL);
request.ContentType = "application/json; charset=utf8";
request.Headers.Add(ADD HEADER HERE IF YOU NEED ONE);
request.Method = WebRequestMethods.Http.Post; // IMPORTANT
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
streamWriter.Write(JsonConvert.SerializeObject(JSONBODYSTRING));
// I USUALLY YOU JSONCONVERT HERE TO SIMPLY SERIALIZE A STRING CONTAINING THE JSON INFO.
//BUT I GUESS YOUR METHOD WOULD ALSO WORK
streamWriter.Flush();
streamWriter.Close();
}
WebResponse response = request.GetResponse();
using (var streamReader = new StreamReader(response.GetResponseStream()))
{
string result = streamReader.ReadToEnd();
// DO WHATEVER YOU'D LIKE HERE
}
} catch (Exception ex)
{
// HANDLE YOUR EXCEPTIONS
}
I want to use google api for creation of gmail user account. I am sending JSON request to server for getting authorization code but I got these error in httpwebresponse :-
Exception Details: System.Net.WebException: The remote server returned an error: (400) Bad Request
var request = (HttpWebRequest)WebRequest.Create(#"https://accounts.google.com/o/oauth2/auth");
request.Method = "POST";
request.ContentType = "text/json";
request.KeepAlive = false;
//request.ContentLength = 0;
using (StreamWriter streamWriter = new StreamWriter(request.GetRequestStream()))
{
string json = "{\"scope\":\"https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile\"," + "\"state\":\"%2Fprofile\"," + "\"redirect_uri\":\"http://gmailcheck.com/response.aspx\"," + "\"response_type\":\"code\"," + "\"client_id\":\"841994137170.apps.googleusercontent.com\"}";
streamWriter.Write(json);
// streamWriter.Flush();
//streamWriter.Close();
}
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
StreamReader responsereader = new StreamReader(response.GetResponseStream());
var responsedata = responsereader.ReadToEnd();
//Session["responseinfo"] = responsereader;
//testdiv.InnerHtml = responsedata;
}
}
As soon as you get an exception, you have to read the actual responce from server there should be something helpfull. Like an error description or extended status code...
For Instance:
try
{
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
... your code goes here....
}
catch (WebException ex)
{
using (WebResponse response = ex.Response)
{
var httpResponse = (HttpWebResponse)response;
using (Stream data = response.GetResponseStream())
{
StreamReader sr = new StreamReader(data);
throw new Exception(sr.ReadToEnd());
}
}
}
I have a foreach with an "If" and when the condition is true, I do a WebResponse to post my item in a server.
Sometimes the code run for two o more items but other times crashes with the following error:
The remote server returned an error: (407) Proxy Authentication Required.
The code:
WebClient client = new WebClient();
string authInfo = "admin:geoserver";
string address = "http://xxxxxxxx:8080/geoserver/rest/workspaces/";
client.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(authInfo));
WebRequest request = WebRequest.Create(address);
request.ContentType = "text/xml";
request.Method = "POST";
request.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(authInfo));
byte[] bret = Encoding.GetEncoding("UTF-8").GetBytes("<workspace><name>" + nameWS + "</name></workspace>");
Stream reqstr = request.GetRequestStream();
reqstr.Write(bret, 0, bret.Length);
reqstr.Close();
try
{
WebResponse response = request.GetResponse();
response.Close();
}
My Environment is C# Visual Studio 2010
how often do you call this? as others have suggested it could be that the server is protected from DOS and your requests are seen like that. It's also valuable to dispose immediately all disposable objects with a using block for example. we had some issues once while leaving too many connections open to our web server, internally in our network. You could adjust your code to look like this:
using(var client = new WebClient())
{
string authInfo = "admin:geoserver";
string address = "http://xxxxxxxx:8080/geoserver/rest/workspaces/";
client.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(authInfo));
var request = WebRequest.Create(address);
request.ContentType = "text/xml";
request.Method = "POST";
request.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.ASCII.GetBytes(authInfo));
byte[] bret = Encoding.GetEncoding("UTF-8").GetBytes("<workspace><name>" + nameWS + "</name></workspace>");
using (var reqstr = request.GetRequestStream())
{
reqstr.Write(bret, 0, bret.Length);
}
try
{
using (var response = request.GetResponse())
{
// your code here...
}
}
catch (Exception exc)
{
System.Diagnostics.Debug.WriteLine(exc.Message);
}
}