ASP.NET MVC 4 to ASP.NET Web API - Error: Only 'http' and 'https' schemes are allowed. Parameter name: requestUri

Question

ASP.NET MVC throws the following error in TEST Server, which I could not reproduce in Developer machines.

Trying to connect to WebAPI Service from MVC and getting the error

Only 'http' and 'https' schemes are allowed. Parameter name: requestUri

I could not get an answer from other questions since they are mainly talking about WCF bindings.

Code:

var credentials = "username:Password";
var encoded = Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes(credentials));
this.client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", encoded);
System.Net.Http.HttpClient client = new HttpClient();
HttpResponseMessage response = client.GetAsync(URL).Result;

Note: Accessing the WebAPI URL through browser returns the data.

Can you please post the exact code you are using the make the call from MVC? — Arsen
– Arsen, Commented Aug 13, 2013 at 14:27
It looks as though your issue is the contents of URL, can you update your question to show what URL is being set to? — Adrian Thompson Phillips
– Adrian Thompson Phillips, Commented Aug 13, 2013 at 15:10

David · Accepted Answer · 2016-02-19 14:57:32Z

6

In anticipation of what might or might not be in your URL parameter, I'm guessing it doesn't start with http:// or https://. For this to work, it must start with one of these two.

So if your URL currently reads (assuming URL is a string):

mycompany.com/myservices

It needs changing to either:

http://mycompany.com/myservices

Or

https://mycompany.com/myservices

If URL isn't a string, but is instead an instance of System.Uri, then you need to do a similar thing when creating this object, or set the URL.Scheme.

edited Feb 19, 2016 at 14:57

David

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answered Aug 13, 2013 at 15:29

Adrian Thompson Phillips

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1 Comment

manu97 Over a year ago

In DEV environment using Visual Studio and IIS Express, I wasn't having any trouble. Once I moved to a IIS server in Test machine and configured as different applications, got this issue. Thank you for your answer and it solved the issue.

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