I cant connect to my SOAP webservice through xamarin android via port 10.0.2.2

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Hi, I've exploring on the Internet about this problem for several days, but I dont know why I cant connect to my SOAP WebService. I ve seen that many others had this problem but many of them could solve it. Every time I face with this error in my Android app:

System.Net.WebException: The request failed with HTTP status 400: BadRequest
  at System.Web.Services.Protocols.SoapHttpClientProtocol.ReceiveResponse

What I have tried:

The Url is: http://10.0.2.2:51036/Areas/Admin/WebServices/SyncWebService.asmx

strRawJson = syncWebService.GetListInfo_GeneralCategory();

The SOAP WebService is into an MVC project.

Posted 1-Apr-20 4:01am

maysam_p82

Updated 1-Apr-20 4:27am

Richard Deeming

v2

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Comments

ZurdoDev 1-Apr-20 10:04am

I would suggest using something like PostMan to test the call. You're probably missing a header or something.

maysam_p82 1-Apr-20 10:30am

But, I have tested it with another MVC application, (obviously with local host:http://localhost:51036/Areas/Admin/WebServices/SyncWebService.asmx)
it works pretty fine.

ZurdoDev 1-Apr-20 10:41am

Yes, but you were testing .Net and now want Android to work. Which means .Net is adding something under the hood that you are not aware of. Which is why PostMan is a good option because then you have to set everything.

maysam_p82 1-Apr-20 10:44am

That's true but I m not sure if Postman can consume 10.0.2.2 Android specific IP address. Anyway, I'm gonna try it right now.

Richard Deeming 1-Apr-20 10:30am

The request you're sending doesn't match the format that the service is expecting to receive.

We can't see the code for your service, and we can't see the code that's calling it, so we can't tell you why, nor how to fix it.

You'll have to debug your code and examine the request that's being sent to try to find out what the problem is.

maysam_p82 1-Apr-20 10:32am

this is the URL from Mobile app: http://10.0.2.2:51036/Areas/Admin/WebServices/SyncWebService.asmx
string strRawJson = string.Empty;
string strJsonString = string.Empty;
DataTable dtValues = new DataTable
{
TableName = "dtGeneralCategory"
};
try
{
syncWebService.Url = "http://10.0.2.2:51036/Areas/Admin/WebServices/SyncWebService.asmx";
strRawJson = syncWebService.GetListInfo_GeneralCategory();
}
catch (Exception ex)
{
var alert = new Android.App.AlertDialog.Builder(this);
alert.SetMessage("خطا در برقراری ارتباط با سرور! ");
alert.SetPositiveButton("بستن", delegate { return; });
alert.Create().Show();
return false;
}
var response = JsonConvert.DeserializeObject(strRawJson);
strJsonString = response.ToString();

dtValues = (DataTable)JsonConvert.DeserializeObject(response.ToString(), (typeof(DataTable)));

maysam_p82 1-Apr-20 10:33am

This is the code I have consumed in SOAP:
[WebMethod]
public string GetListInfo_GeneralCategory()
{
string strFolderPath = "\\Areas\\Admin\\UploadedFiles\\GeneralCategories\\";
List<generalcategory> lstGeneralCategory = new List<generalcategory>();
lstGeneralCategory = mapSyncWebService.GetListInfo_GeneralCategory();
if (!string.IsNullOrEmpty(mapSyncWebService.errMessage))
{
return string.Empty;
}
if (lstGeneralCategory.Count == 0)
return string.Empty;

if (Directory.Exists(Server.MapPath(strFolderPath)))
{
string[] arrFilePaths = Directory.GetFiles(strFolderPath);
for (int i = 0; i < lstGeneralCategory.Count; i++)
{
foreach (var strFileName in arrFilePaths)
{
if (strFileName.Split('_')[0] == "imgGeneralCategory" && strFileName.Split('_')[1] == lstGeneralCategory.ElementAt(i).ImageFilePath.Split('_')[1])
lstGeneralCategory.ElementAt(i).ImageBytes = File.ReadAllBytes(Server.MapPath(strFolderPath + "\\" + strFileName)).ToString();
}
}
}
return JsonConvert.SerializeObject(lstGeneralCategory);
}

maysam_p82 1-Apr-20 10:41am

But the problem is that I face the "Error 400 bad request" in mobile app before I enter the service, and I think the emulator cant see the 10.0.2.2 at all. Because when I put the IP in the emulator chrome browser I face this error.:(.

Richard Deeming 1-Apr-20 10:46am

A 400 error means your request has reached the server, but the server didn't understand the request.

maysam_p82 1-Apr-20 10:50am

yes, But is there any other way to understand the problem? And will Postman tell us about the undergoing problem?

maysam_p82 1-Apr-20 10:51am

I think Postman should see my service from the view of Android Emulator. Does it tell us as well?

Richard Deeming 1-Apr-20 11:00am

Postman will let you generate and send a request to the service. It won't show you the request that your application is sending to the service.

You could try using Failed Request Tracing[^] to trace the failed requests to the service. It looks like you're running the service in IIS Express, so FRT should be turned on by default and logging to %USERPROFILE%\Documents\IISExpress\TraceLogFiles.

Your [WebMethod] seems to be calling another web service. If it is, you'll need to work out whether the error is caused by the communication between your app and your service, or between your service and the other service.

maysam_p82 1-Apr-20 11:30am

how to find out the reason service app rejects the request from ip 10.0.2.2?:(

Richard Deeming 1-Apr-20 11:37am

Try using Postman from another computer on your network, using the 10.0.2.2 address.

If it works using localhost but not using the IP address, then either the Windows Firewall isn't allowing the connection, or the IP address is wrong.

If it works from another computer on your network, then make sure your Android device / emulator is connected to your local network.

maysam_p82 1-Apr-20 11:43am

No I ve already disabled the firewall. But I think the problem is that IIS refuses all requests on 127.0.0.1 (as it s a vital for android and is another meaning of 10.0.2.2)
how to enable it ? I ve used some methods such as applicationhost.config and tried to change this file but I wasnt success.

Richard Deeming 1-Apr-20 11:48am

It's going to be due to the <binding> for the site:
iis 7 - Bad Request - Invalid Hostname IIS7 - Stack Overflow[^]

maysam_p82 1-Apr-20 11:39am

Right now I tested the URL under IP:127.0.0.1 and it returns:

<title>Bad Request

Bad Request - Invalid Hostname

HTTP Error 400. The request hostname is invalid.

maysam_p82 1-Apr-20 12:12pm

Now the binding is like this :
<binding protocol="http" bindinginformation="*:80:*">
but it still doesnt work with 127.0.0.1:51036

maysam_p82 1-Apr-20 11:22am

No my web service doesnt call another. I tested the url with Postmane and it works fine. With(localhost)

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