How can the error Client found response content type of text html be interpreted

Question

I m using C  and connecting to a WebService via an auto-generated C  proxy object  The method I m calling can be long running  and sometimes times out  I get different errors back  sometimes I get a System Net WebException or a System Web Services Protocols SoapException  These exceptions have properties I can interrogate to find the specific type of error from which I can display a human-friendly version of to the user   But sometimes I just get an InvalidOperationException  and it has the following Message  Is there any way I can interpret what this is without digging through the string for things I recognize  that feels very dirty  and isn t internationalization agnostic  the error message might come back in a different language   Client found response content type of  text html  charset utf-8   but expected  text xml   The request failed with the error message  --  lt html gt       lt head gt       lt title gt Request timed out  lt  title gt                           lt style gt           body  font-family  Verdana  font-weight normal font-size   7em color black             p  font-family  Verdana  font-weight normal color black margin-top  -5px           b  font-family  Verdana  font-weight bold color black margin-top  -5px           H1   font-family  Verdana  font-weight normal font-size 18pt color red            H2   font-family  Verdana  font-weight normal font-size 14pt color maroon            pre  font-family  Lucida Console  font-size   9em            marker  font-weight  bold  color  black text-decoration  none             version  color  gray             error  margin-bottom  10px             expandable   text-decoration underline  font-weight bold      color navy          cursor hand             lt  style gt       lt  head gt        lt body bgcolor  white  gt                lt span gt  lt H1 gt Server Error in   PerformanceManager  Application  lt hr     width 100  size 1 color silver gt  lt  H1 gt                lt h2 gt   lt i gt Request timed out  lt  i gt   lt  h2 gt  lt  span gt                lt font face  Arial  Helvetica  Geneva  SunSans-Regular  sans-serif   gt                lt b gt  Description   lt  b gt An unhandled exception occurred during the execution of the current web request  Please review the stack trace for more information about the error and where it originated in the code                lt br gt  lt br gt                lt b gt  Exception Details   lt  b gt System Web HttpException  Request timed out  lt br gt  lt br gt                lt b gt Source Error  lt  b gt   lt br gt  lt br gt                lt table width 100  bgcolor   ffffcc  gt                  lt tr gt                     lt td gt                         lt code gt   An unhandled exception was generated during the execution of the current web request  Information regarding the origin and location of the exception can be identified using the exception stack trace below  lt  code gt                      lt  td gt                  lt  tr gt               lt  table gt                lt br gt                lt b gt Stack Trace  lt  b gt   lt br gt  lt br gt                lt table width 100  bgcolor   ffffcc  gt                      lt tr gt                     lt td gt                         lt code gt  lt pre gt    HttpException  0x80004005   Request timed out    lt  pre gt  lt  code gt                      lt  td gt                  lt  tr gt               lt  table gt                lt br gt                lt hr width 100  size 1 color silver gt                lt b gt Version Information  lt  b gt   Microsoft  NET Framework Version 2 0 50727 312  ASP NET Version 2 0 50727 833               lt  font gt        lt  body gt   lt  html gt   lt  --   HttpException   Request timed out  -- gt  --    Edit  I have a try-catch around the method on the web-server  I have debugged it  and the web-server method returns  after a minute or so  without any exception  I also added an unhandled exception handler in the web service and a breakpoint there wasn t hit  As soon as the web-service returns  I get this error in the client instead of the result I expected

User · Answer

If you are using  NET version 4 0  the validateRequestion is turned on by default for all the pages  in previous versions 1 1 and 2 0 it was only for aspx page  You can turn the default validation off  In that case you have to do the due diligence and make sure that the data is clean  Use HtmlEncode  Do the following to turn the validation off  In the web config  add the following lines for system web    lt httpRuntime requestValidationMode  2 0    gt    and     lt pages validateRequest  false    gt    You can read more about this http   www asp net learn whitepapers aspnet4 breaking-changes also http   msdn microsoft com en-us library ff649310 aspx  Hope this helps

User · Answer

This is happening because there is an unhandled exception in your Web service  and the  NET runtime is spitting out its HTML yellow screen of death server error exception dump page  instead of XML   Since the consumer of your Web service was expecting a text xml header and instead got text html  it throws that error   You should address the cause of your timeouts  perhaps a lengthy SQL query     Also  checkout this blog post on Jeff Atwood s blog that explains implementing a global unhandled exception handler and using SOAP exceptions

User · Answer

The problem I had was related to SOAP version  The asmx service was configured to accept both versions  1 1 and 1 2  so  I think that when you are consuming the service  the client or the server doesn t know what version resolve   To fix that  is necessary add   using  wsWebService yourService   new wsWebService          yourService Url    https   myUrlService com wsWebService asmx op someOption       yourService UseDefaultCredentials   true     this line depends on your authentication type     yourService SoapVersion   SoapProtocolVersion Soap11     asign the version of SOAP     var result   yourService SomeMethod  Parameter        Where wsWebService is the name of the class generated as a reference

User · Answer

The webserver is returning an http 500 error code   These errors generally happen when an exception in thrown on the webserver and there s no logic to catch it so it spits out an http 500 error   You can usually resolve the problem by placing try-catch blocks in your code

User · Answer

That means that your consumer is expecting XML from the webservice but the webservice  as your error shows  returns HTML because it s failing due to a timeout    So you need to talk to the remote webservice provider to let them know it s failing and take corrective action  Unless you are the provider of the webservice in which case you should catch the exceptions and return XML telling the consumer which error occurred  the  remote provider  should probably do that as well

User · Answer

Is your webservice configured correctly in IIS  The pool its using  the version of ASP NET  2 0  is set  Can you browse the  asmx   Talking about exceptions  try to put an try-catch block in the line that access your webservice  Put and catch System Web Services Protocolos SoapException    Also  you can set a Timeout for your webservice object

User · Answer

I had got this error after changing the web service return type and SoapDocumentMethod   Initially it was    WebMethod  public int Foo         return 0      I decided to make it fire and forget type like this    SoapDocumentMethod OneWay   true    WebMethod  public void Foo         return      In such cases  updating the web reference helped   To update a web service reference    Expand solution explorer Locate Web References - this will be visible only if you have added a web service reference in your project Right click and click update web reference

User · Answer

Delete web config file and insert again  http   forums asp net post 916808 aspx

User · Answer

I had this happen as a result of a configuration error in web config  Checking the connection string etc might be the answer for the time out

[c#] How can the error 'Client found response content type of 'text/html'.. be interpreted

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