Error facing on communication between asp.net webapi server and angular2 application











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I am facing the CORS related issue when i try to connect my angular2 application and asp.net webapi application.



Error:-
register:1 Access to XMLHttpRequest at 'http://localhost:49457/api/UserDetails' from origin 'http://localhost:4200' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:4200, http://localhost:4200', but only one is allowed.



Here is my code for connecting for calling asp.net webapi url through my angular2 app:-



User.service.ts



GetUser(userobj:user):Observable<User>  
{

return this.http.get<User>(`http://localhost:49457/api/UserDetails`,{responseType:"text"})
.subscribe(
function(response)
{
console.log("user details retreived successfully");
},
function(error)
{
console.log(error);
});
}


This is my code for asp.net webapi,



 public class UserDetailsController : ApiController
{
private sampledbEntities dbentity = new sampledbEntities();
// GET api/<controller>
public IQueryable<Userdetail> GetUserdetails()
{
return dbentity.userdetails;
}
}


Actually when i run my asp.netwebapi server it is retrieving data correctly through browser.And also i have enabled
CORS in webapiconfig.cs,



void Register(HttpConfiguration config)
{
var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
config.EnableCors(corsAttr);
}


in web.config.cs,



 <httpProtocol>  
<customHeaders>
<add name="Access-Control-Allow-Origin" value="http://localhost:4200" />
<add name="Access-Control-Allow-Headers" value="Origin, Content-Type, X-Auth-Token" />
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
</customHeaders>
</httpProtocol>


After enabling CORS in Webapiconfig.cs and web.config also i am facing the same error.



Please clarify how do i come out of this error,










share|improve this question


























    up vote
    0
    down vote

    favorite












    I am facing the CORS related issue when i try to connect my angular2 application and asp.net webapi application.



    Error:-
    register:1 Access to XMLHttpRequest at 'http://localhost:49457/api/UserDetails' from origin 'http://localhost:4200' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:4200, http://localhost:4200', but only one is allowed.



    Here is my code for connecting for calling asp.net webapi url through my angular2 app:-



    User.service.ts



    GetUser(userobj:user):Observable<User>  
    {

    return this.http.get<User>(`http://localhost:49457/api/UserDetails`,{responseType:"text"})
    .subscribe(
    function(response)
    {
    console.log("user details retreived successfully");
    },
    function(error)
    {
    console.log(error);
    });
    }


    This is my code for asp.net webapi,



     public class UserDetailsController : ApiController
    {
    private sampledbEntities dbentity = new sampledbEntities();
    // GET api/<controller>
    public IQueryable<Userdetail> GetUserdetails()
    {
    return dbentity.userdetails;
    }
    }


    Actually when i run my asp.netwebapi server it is retrieving data correctly through browser.And also i have enabled
    CORS in webapiconfig.cs,



    void Register(HttpConfiguration config)
    {
    var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
    config.EnableCors(corsAttr);
    }


    in web.config.cs,



     <httpProtocol>  
    <customHeaders>
    <add name="Access-Control-Allow-Origin" value="http://localhost:4200" />
    <add name="Access-Control-Allow-Headers" value="Origin, Content-Type, X-Auth-Token" />
    <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
    </customHeaders>
    </httpProtocol>


    After enabling CORS in Webapiconfig.cs and web.config also i am facing the same error.



    Please clarify how do i come out of this error,










    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I am facing the CORS related issue when i try to connect my angular2 application and asp.net webapi application.



      Error:-
      register:1 Access to XMLHttpRequest at 'http://localhost:49457/api/UserDetails' from origin 'http://localhost:4200' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:4200, http://localhost:4200', but only one is allowed.



      Here is my code for connecting for calling asp.net webapi url through my angular2 app:-



      User.service.ts



      GetUser(userobj:user):Observable<User>  
      {

      return this.http.get<User>(`http://localhost:49457/api/UserDetails`,{responseType:"text"})
      .subscribe(
      function(response)
      {
      console.log("user details retreived successfully");
      },
      function(error)
      {
      console.log(error);
      });
      }


      This is my code for asp.net webapi,



       public class UserDetailsController : ApiController
      {
      private sampledbEntities dbentity = new sampledbEntities();
      // GET api/<controller>
      public IQueryable<Userdetail> GetUserdetails()
      {
      return dbentity.userdetails;
      }
      }


      Actually when i run my asp.netwebapi server it is retrieving data correctly through browser.And also i have enabled
      CORS in webapiconfig.cs,



      void Register(HttpConfiguration config)
      {
      var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
      config.EnableCors(corsAttr);
      }


      in web.config.cs,



       <httpProtocol>  
      <customHeaders>
      <add name="Access-Control-Allow-Origin" value="http://localhost:4200" />
      <add name="Access-Control-Allow-Headers" value="Origin, Content-Type, X-Auth-Token" />
      <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
      </customHeaders>
      </httpProtocol>


      After enabling CORS in Webapiconfig.cs and web.config also i am facing the same error.



      Please clarify how do i come out of this error,










      share|improve this question













      I am facing the CORS related issue when i try to connect my angular2 application and asp.net webapi application.



      Error:-
      register:1 Access to XMLHttpRequest at 'http://localhost:49457/api/UserDetails' from origin 'http://localhost:4200' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values 'http://localhost:4200, http://localhost:4200', but only one is allowed.



      Here is my code for connecting for calling asp.net webapi url through my angular2 app:-



      User.service.ts



      GetUser(userobj:user):Observable<User>  
      {

      return this.http.get<User>(`http://localhost:49457/api/UserDetails`,{responseType:"text"})
      .subscribe(
      function(response)
      {
      console.log("user details retreived successfully");
      },
      function(error)
      {
      console.log(error);
      });
      }


      This is my code for asp.net webapi,



       public class UserDetailsController : ApiController
      {
      private sampledbEntities dbentity = new sampledbEntities();
      // GET api/<controller>
      public IQueryable<Userdetail> GetUserdetails()
      {
      return dbentity.userdetails;
      }
      }


      Actually when i run my asp.netwebapi server it is retrieving data correctly through browser.And also i have enabled
      CORS in webapiconfig.cs,



      void Register(HttpConfiguration config)
      {
      var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
      config.EnableCors(corsAttr);
      }


      in web.config.cs,



       <httpProtocol>  
      <customHeaders>
      <add name="Access-Control-Allow-Origin" value="http://localhost:4200" />
      <add name="Access-Control-Allow-Headers" value="Origin, Content-Type, X-Auth-Token" />
      <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
      </customHeaders>
      </httpProtocol>


      After enabling CORS in Webapiconfig.cs and web.config also i am facing the same error.



      Please clarify how do i come out of this error,







      asp.net-web-api angular2-services angular4-httpclient






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 12 at 4:11









      rajula

      53




      53
























          1 Answer
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          Replace http://localhost:4200 with "*" from EnableCorsAttribute method.



          void Register(HttpConfiguration config)
          {
          var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
          config.EnableCors(corsAttr);
          }


          and remove httpProtocol configuration settings from web.config.






          share|improve this answer





















          • i have done above changes also, then also the same error
            – rajula
            Nov 13 at 12:06










          • Are you passing anything else in header with request from angular application?
            – Hardik
            Nov 14 at 3:37











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          up vote
          0
          down vote













          Replace http://localhost:4200 with "*" from EnableCorsAttribute method.



          void Register(HttpConfiguration config)
          {
          var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
          config.EnableCors(corsAttr);
          }


          and remove httpProtocol configuration settings from web.config.






          share|improve this answer





















          • i have done above changes also, then also the same error
            – rajula
            Nov 13 at 12:06










          • Are you passing anything else in header with request from angular application?
            – Hardik
            Nov 14 at 3:37















          up vote
          0
          down vote













          Replace http://localhost:4200 with "*" from EnableCorsAttribute method.



          void Register(HttpConfiguration config)
          {
          var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
          config.EnableCors(corsAttr);
          }


          and remove httpProtocol configuration settings from web.config.






          share|improve this answer





















          • i have done above changes also, then also the same error
            – rajula
            Nov 13 at 12:06










          • Are you passing anything else in header with request from angular application?
            – Hardik
            Nov 14 at 3:37













          up vote
          0
          down vote










          up vote
          0
          down vote









          Replace http://localhost:4200 with "*" from EnableCorsAttribute method.



          void Register(HttpConfiguration config)
          {
          var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
          config.EnableCors(corsAttr);
          }


          and remove httpProtocol configuration settings from web.config.






          share|improve this answer












          Replace http://localhost:4200 with "*" from EnableCorsAttribute method.



          void Register(HttpConfiguration config)
          {
          var corsAttr = new EnableCorsAttribute("http://localhost:4200", "*", "*");
          config.EnableCors(corsAttr);
          }


          and remove httpProtocol configuration settings from web.config.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 12 at 4:35









          Hardik

          1,3211219




          1,3211219












          • i have done above changes also, then also the same error
            – rajula
            Nov 13 at 12:06










          • Are you passing anything else in header with request from angular application?
            – Hardik
            Nov 14 at 3:37


















          • i have done above changes also, then also the same error
            – rajula
            Nov 13 at 12:06










          • Are you passing anything else in header with request from angular application?
            – Hardik
            Nov 14 at 3:37
















          i have done above changes also, then also the same error
          – rajula
          Nov 13 at 12:06




          i have done above changes also, then also the same error
          – rajula
          Nov 13 at 12:06












          Are you passing anything else in header with request from angular application?
          – Hardik
          Nov 14 at 3:37




          Are you passing anything else in header with request from angular application?
          – Hardik
          Nov 14 at 3:37


















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