C# - HttpWebRequest Connection Limit And RestFUL Server?
Dec 21, 2010
I have created a server product that is connecting to some social network servers and sending to data which status update etc. The server already authenticated to necessary social networks servers by users who is using this solution.
Actually, I have no problem at this time, but I think I will.
My server will be open a thousands of concurrent request to neccessary servers via Http with C# HttpWebRequest instance. I already know that It's possible to change concurrent request limits with below propery.
ServicePointManager.DefaultConnectionLimit AFAIK, this limit is max 100 evet you set more than 100. So, I will be faced with bottleneck problem with HttpWebRequest even change the DefaultConnectionLimit property of ServicePointManager.
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Nov 23, 2010
I'm getting the "The underlying connection was closed: The connection was closed unexpectedly." error while trying to POST using the HttpWebRequest class on the production server, on my dev machine it works fine.
I originally tried using the WebClient class but I switched to the HttpWebRequest to try some of the suggestions I found while researching the issue (such as setting KeepAlive to false, PreAuthenticate true and ProtocolVersion to 1.0).
Since it's only happening on the production server, i'm guessing that it might have something to do with IIS.
Here's my code
[Code]....
If set the Target Framework (I used a new project for testing) to 2.0 (I didn't test every version of the framework) it works. I'm guessing that .net handles the security differently in .net 4.0.
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Apr 4, 2011
I am testing out a few different public RESTful APIs each differing in http argument value name, but in concept all work similarly. However none of the companies are connected so it must be something on my end.
Within .NET I get the following error when trying to obtain the HttpWebResponse:
Message: "The server committed a protocol violation. Section=ResponseStatusLine"
Status: ServerProtocolViolation {11}
Using Fiddler, I am finding that the headers coming back are non-existent and this is the cause of the issue (not even present and improperly formatted):
HTTP/1.0 200 This buggy server did not return headers
The parameter I am sending in is a lengthy text news article. I have stripped ALL puntuation, characters, etc just to make sure nothing wans interferring. I build the text out using a StringBuilder and then create the URI like below:
Dim sb As New StringBuilder
sb.Append("&apiKey=" + HttpUtility.UrlEncode("123456789"))
sb.Append("&inputText=" + HttpUtility.UrlEncode(Me.MyTestText))
Dim ApiHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(New Uri(BaseRequestURL + sb.ToString.Trim())), HttpWebRequest)
Dim ApiHttpWebResponse As HttpWebResponse = CType(ApiHttpWebRequest.GetResponse(), HttpWebResponse)
This code DOES work with most text I send it. The interesting thing I am finding is that if I shorten the text I am sending then it works! I can't figure out exactly the threashold or breaking point. The stringbuilders values expand after the HttpUtility.UrlEncode function is run against it. However the text in size is only about 5-8 kilobytes in size and well below any size limitations set forth by the 'httpWebRequest' .config settings as laid out in the MSDN or by that of any of the APIs I am using (for example 1 limit is 150 kilobytes of text). I even tried setting all of those values to "-1" in the web.config which means: "A value of -1 indicates that no size limit will be imposed on the response headers."
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Feb 16, 2011
ASP.NET 4 - IIS 7
I would like to limit the number of connections to one of my website.What I want to do specifically is show the visitors a simple custom page warning them that the site is too busy and they should come back later.I know if I limit the nbr of connections in IIS it'll work but It doesn't show an elegant page.
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Jun 13, 2010
When using .net remoting, does the server limit incoming client remoting calls?
I find a particular remoting call (during ASP.NET page rendering) to take from 200ms to 1500ms. While the underlying data call is only 50ms. Factoring in remoting overhead of 150ms per call, the only difference between the two cases is that the latter scenario has about a dozen more parallel remoting calls in progress. So my guess is that when too many remoting calls are happening, some will get queued up? I also doubt system resource is the cause of the delay because it is not nearly saturated.
Searching MSDN, I find the below:
http://msdn.microsoft.com/en-us/library/ms973907.aspx
clientConnectionLimit: specifies how
many connections can be simultaneously
opened to a given server. The default
is 2. This is exactly the same as the
connection limit on ServicePoint in
the net classes.
That seems awfully low to me and if were the case, my app's performance would have been much worse. Can someone confirm if there is indeed a connection limit or some other throttling in .net remoting?
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Nov 23, 2010
I just installed sql server 2008 R2 on my computer. I am trying to connect to sql server throught my C# code and everytime I run the C# program,
I get this error "A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) "
The connection string that I used in my web.config file is
[Code]....
I am not sure what am I doing wrong, but I followed this article below step by step and still I am getting the same error
http://blog.sqlauthority.com/2009/05/21/sql-server-fix-error-provider-named-pipes-provider-error-40-could-not-open-a-connection-to-sql-server-microsoft-sql-server-error/
My instance name is MSSQLSERVER and the server that I am using is on my local machine and it has my computer name in it.
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Jan 26, 2010
I am trying to simulate a POST to a form on an external server that does not require any authentication, and capture a sting containing the resulting page. This is what the form looks like:
<FORM METHOD="POST" ACTION="/controller" NAME="GIN">
<INPUT type="hidden" name="JSPName" value="GIN">
Field1:
<INPUT type="text" name="Field1" size="30"
maxlength="60" class="txtNormal" value="">
</FORM>
This is what my code looks like:
ASCIIEncoding encoding = new ASCIIEncoding();
string postData = "Field1=VALUE1&JSPName=GIN";
byte[] data = encoding.GetBytes(postData);
// Prepare web request...
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("https://XXX/controller");
myRequest.Method = "POST";
myRequest.ContentType = "text/html";
myRequest.ContentLength = data.Length;
Stream newStream = myRequest.GetRequestStream();
// Send the data.
newStream.Write(data, 0, data.Length);
StreamReader reader = new StreamReader(newStream);
string text = reader.ReadToEnd();
MessageBox.Show(text);
newStream.Close();
Currently, the code returns "Stream was not readable".
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Feb 8, 2011
I'm trying to debug a specific issue with my ASP.NET application. The client runs the following code:
void uploadFile( string serverUrl, string filePath )
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.
Create( serverUrl );
CredentialCache cache = new CredentialCache();
cache.Add( new Uri( serverUrl ), "Basic", new NetworkCredential( "User", "pass" ) );
request.Credentials = cache;
request.Method = "POST";
request.ContentType = "application/octet-stream";
request.Timeout = 60000;
request.KeepAlive = true;
using( BinaryReader reader = new BinaryReader(
File.OpenRead( filePath ) ) ) {
request.ContentLength = reader.BaseStream.Length;
using( Stream stream = request.GetRequestStream() ) {
byte[] buffer = new byte[1024];
while( true ) {
int bytesRead = reader.Read( buffer, 0, buffer.Length );
if( bytesRead == 0 ) {
break;
}
stream.Write( buffer, 0, bytesRead );
}
}
}
HttpWebResponse result = (HttpWebResponse)request.GetResponse();
//handle result - not relevant
}
and Write() throws an exception with "Unable to write data to the transport connection: An established connection was aborted by the software in your host machine." text. I used System.Net tracing and found that something goes wrong when I send the request with Content-Length set.
Specifically if I omit everything that is inside using statement in the code above the server promptly replies with WWW-Authenticate and then the client reposts the request with WWW-Authenticate and everything goes fine except the file in not uploaded and the request fails much later.
I'd like to do the following: send an request without data, wait for WWW-Authenticate, then repeat it with WWW-Authenticate and data. So I tried to modify the code above: first set all the parameters, then call GetResponse(), then do sending, but when I try to set ContentLength property an exception is thrown with "This property cannot be set after writing has started" text. So HttpWebRequest seems to be non-reusable.
How do I reuse it for resending the request without closing the connection?
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Oct 19, 2010
I am working on a .NET1.1 application. I want to download file on the web servers using httpwebresponse.
How to download a file on the webserver using httpwebresponse using C# code?
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Aug 16, 2010
I have set Private Memory limit of 200mb in IIS 7 for an application pool. The Private Working Set memory(Task Manager) for the application is always below 125mb but the number of page faults have increased a lot and application cache is getting cleared frequently after setting the limit.
I haven't set any limit on Virtual Memory.why the cache is getting cleared even when the Private memory used is below the allocated memory?
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Jun 18, 2010
I'm trying to post a value to an external site and have managed to piece it together using HttpWebRequest. My problem is that this behaves like a server.transfer. ie it maintains the url. As a result the page I'm posting to doesn't link to any of it's images or stylesheet. Can anyone give me a simple way to do an old style post to an external site?
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Jul 30, 2010
i desgin web site with sqlexpress 2008 now i want to convert it to sql standard enterprise i can or not? if it posible how i can convert my database from sqlexpress limit to sql server standard unlimit
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Sep 30, 2010
I have VS 2010 professional. I am trying to open "ASP.Net Configuration" through Project -> ASP.Net Configuration.
It pops up the Notification about the ASP.Net Development Server localhost but doesn't open ASP.Net Configuration in the default browser.I clicked on the Root Url (by double clicking on the 'development server' at the right bottom from Notification Manager).
It throws following error
"An error was encountered. Please return to the previous page and try again."
Clicking on "How do i use this tool".It opened page with error.
Tool Has Timed Out
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Oct 22, 2010
Hoping someone can point me to a solution, haven't been able to find one yet.
I'm using the standard way for send HttpWebRequest
[Code]....
As you can see from Fiddler/SOAPUI it does return the SOAP fault, however using HttpWebRequest i can't capture the response.
Returning 500 triggers my exception handling and Capturing the WebException doesn't expose the response.
Does anyone know how to capture this response xml in the case of 500 Internal Server Errors.
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Aug 16, 2010
I want to call my WebService using HttpWebRequest, but I get Error:The remote server returned an error: (500) Internal Server Error. The webservice works fine through the following url: [URL]
[Code]....
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Oct 15, 2010
i am working in asp.net mvc & want to create a restful web service. how can i create a restful web service in MVC & how can i use it ? My requirement is : i have an application server which send some parameters to web service & the web service should connect to remote server & return image on path (whose path will be generated by the parameters from application server).
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Apr 26, 2010
I simply want to create a fairly basic REST service, so that I can expose some of the data in my asp.net/SQL server application to the outside works, like this.....
http://domain.com/api/offices - would return an xml set of office locations. http://domain.com/api/offices/15 - would return all the details of office 15.
It's all fairly standard stuff (including basic authentication) but there seem to be several ways to achieve this using Microsoft technologies and I don't really know where to start. These seem to be the options...
1) WCF
2) ASP.NET MVC
3) ADO.NET Data Services
4) Rest Starter Kit project templates?
Which of these is the easiest and most "up-to-date" solution to creating a web service?
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Nov 10, 2010
I have the following query, the relationship is mutiple pictures per dog and multiple dogs per registered User. the query below will return dogs that belong to users that have not expired. the problem is that some users have many dogs and other users only have one dog listed, the query below will return a record for every dog. What I would like to do is return a random dog per user and only one dog per user each time the query executes. therefore if I have 10 users and 50 dogs I would like my quesry to only return 10 dogs one beloinging to each user, and the next time the quesry executes it would be nice if it once again return 10 dogs but a different 10 dogs 1/per user where it was able..
[Code]....
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Feb 11, 2011
I have a restful controller that has your standard REST HTTP Verbs: Get,Post, Put, Delete. The problem I am having is that although my controllers are decorated to accept these verbs, when I execute my REST action, it can only hit my Get and Post methods. I have the attributes on top of the controller actions: HttPut, HttpDelete, HttpPost, and HttpGet. I also have the the override method in my forms: @Html.HttpMethodOverride(HttpVerbs.Put) When I submit my form, I get a 404 error from IIS 7.5, saying the static file handler couldn't find the resource. Strangely the same forms work in Cassini, so I think it is something in IIS7.5's setup.
What do I need to do to get IIS 7.5 to handle REST verbs like PUT and DELETE with Asp.Net MVC 3? I have already removed WebDAV and have looked through the handlers but the ones I am modifying seem to do nothing. My current setup is Asp.Net MVC 3, IIS7.5 on Windows 7.
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Feb 15, 2010
I want to create a simple ASP.NET MVC RESTful API, but I want to create it on Azure.tips & tricks, or examples on how to do this?
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Feb 4, 2010
I am using VS2008 pro to develop my web application. my project target framework is 3.5. I can add web service (.asmx) to it. But there is no .svc for me to add, do I need to install WCF REST Starter Kit? (but it is only in Preview 2)Or should I add an WCF service project to my solution?
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Jan 15, 2011
i am in the process of creating a restful service with WCF, the service is likely to be consumed by at least 500 people at any given time. What settings would i need to set in order to deal with this.
Here is a sample of what i have so far;
[Code]....
And this is an example of a method being called;
[Code]....
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Feb 7, 2010
First, I'm looking for a a small example of how to handle a series of RESTful URLs, such as /Account/{userName} and /Account/{userName}/Profile with a single HttpHandler. At this time, I'm not interested in embracing MVC or using the REST Starter Kit. Should I place the HttpHandler class in a Class Library? Should I publish to the root of the RESTful URL?
My second issue stems from the fact that my ASP.NET hosting is done through a web-hosting company. Will I need to ask their tech team to configure IIS for me? Is that normal practice?
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Apr 26, 2010
I've been tasked with porting/refactoring a Web Application Platform that we have from ASP.NET to MVC.NET. Ideally I could use all the existing platform's configurations to determine the properties of the site that is presented.Is it RESTful to keep a SiteConfiguration object which contains all of our various page configuration data in the System.Web.Caching.Cache? There are a lot of settings that need to be loaded when the user acceses our site so it's inefficient for each user to have to load the same settings every time they access.
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Jan 18, 2011
I want to implement a restful service in ASP.NET. I want it to be compatible with .Net 2.0 and IIS 5+. I am constrained to not use ASP.NET MVC or REST starter kit. By reading on internet I have learned that it can be implemented using HTTPHandlers. The problem is, the request will come in as a POST request. And I want to URL to be like:
http://abc.com/MyService/MyMethod1/
and
http://abc.com/MyService/MyMethod2/
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