C# Only http and https schemes are allowed - HttpClient

Question

C# Only http and https schemes are allowed - HttpClient

Markus Freitag 3,791

Hello,

I have a problem.

using (HttpClient client = new HttpClient())
{

 client.BaseAddress = new Uri(CFG.Baseaddress); 
 client.Timeout = new TimeSpan(0, 0, CFG.Timeout);

 string authorization = $"{CFG.Username}:{CFG.Password}";

 client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes(authorization)));
 urlParameters = CFG.UrlGetOrderData.Replace("{orderId}", orderId);
 response = client.GetAsync(urlParameters).Result;     ///######


// My request
https://192.165.22.11:5000/api/Scada/ProductionOrderNonSerializedMaterialValidate?productionOrderNo=23214

/// #####Exception Only http and https schemes are allowed Parametername RequestUri

Why? What can the solution look like? What do I have to do?

The server can be different after all?
When I call the address in Edge it works.
Not with the code! Why?

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Answer 1

AgaveJoe 30,126

The error indicates the base address does not start with http or https. Please run your code through the debugger to find the value of CFG.Baseaddress. Unfortunately, you did not share this part of the code.

Keep in mind, you are not implementing HttpClient according to the openly published documentation.

HttpClient Class

Use async/await according to he openly published documentation rather than Result which blocks the main thread.

Asynchronous programming with async and await

Use string interpolation rather than replace.

$ - string interpolation (C# reference)

Markus Freitag 3,791 Reputation points

2022-03-22T11:00:40.9+00:00
https://192.165.22.11:5000/ // BaseAddress api/Scada/ProductionOrderNonSerializedMaterialValidate?productionOrderNo={orderId} // urlParameters

I have two customers, with one it works, with the other not. What exactly should I change? Or is it the customer?
AgaveJoe 30,126 Reputation points

2022-03-22T11:19:15.587+00:00

I'm a little confused by your response, 192.165.22.11 is an internal address. Based on the carelessness of your original code, l'm guessing 192.165.22.11 is the development environment base address not the second customer's base address.

Again, the error indicates the URL is missing http or https.
Markus Freitag 3,791 Reputation points

2022-03-22T12:11:11.267+00:00

The original error message.

Do you have any tip for me? It is https and it works for customer 1 well, but not for customer 2.

Thanks in advance. What can be the cause, what can I do? What can I check?
Viorel 122.6K Reputation points

2022-03-22T14:23:05.177+00:00

Maybe the displayed detail (the URL) is not relevant for this issue?
Markus Freitag 3,791 Reputation points

2022-03-22T15:18:31.143+00:00

Maybe the displayed detail (the URL) is not relevant for this issue?

What you mean here? Can you make a sample?
Viorel 122.6K Reputation points

2022-03-22T19:38:32.393+00:00

I mean that the displayed URL in the [ERROR] line of the picture maybe is not the URL that caused the exception.
AgaveJoe 30,126 Reputation points

2022-03-22T19:41:51.34+00:00

This post is very confusing. The original code does not explain how any of the variables are populated or the actual values. When asked you stated the URL is https://192.165.22.11:5000 (which has its own issues). Now you share an error message with a domain name and different port. It could be, as stated by Viorel-1, that the issue is elsewhere in the code and what you are showing us is not relevant.

Unfortunately, you're asking questions as if we have intimate knowledge of your code and design. We can only go by the information you post on the forum. For all we know a service end point returned this error and your client code is receiving the error. How did you capture the error?
Karen Payne MVP 35,586 Reputation points Volunteer Moderator

2022-03-22T23:00:11.847+00:00

If it works with one and not the other perhaps check windows event and IIS logs.

Markus Freitag 3,791

Hello,

response = client.GetAsync(urlParameters).Result; // That is the reason, but why? AAA inside log BBB not!

I now have detailed information.
Can you all please help again. What can be the cause? Thanks in advance.

HttpResponseMessage response;
string urlParameters = "";
try
{
    using (HttpClient client = new HttpClient())
    {
        client.BaseAddress = new Uri(CfgScadaSystem.Baseaddress); 
        client.Timeout = new TimeSpan(0, 0, CfgScadaSystem.Timeout);

        string authorization = $"{CfgScadaSystem.Username}:{CfgScadaSystem.Password}";
        Log.WriteLog($"[C][RO], authorization='{authorization}'");

        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes(authorization)));
        urlParameters = CfgScadaSystem.UrlGetOrderData.Replace("{orderId}", orderId);
        Log.WriteLog($"[C][RO], RequestMES=\n'{CfgScadaSystem.Baseaddress}{urlParameters}'");
        Log.WriteLog($"[C][RO], Client BaseAddress= '{client.BaseAddress}' ");


        Log.WriteLog("AAA");
        response = client.GetAsync(urlParameters).Result;  // 
        Log.WriteLog("BBB");
    }

Markus Freitag 3,791

The log!

10:42:19.245;[debug]; [C][RO], authorization='wagxxPC:c3xxxxxxxxxxxxxxy'
10:42:19.245;[debug]; [C][RO], RequestMES=
'https://ebip-wag-acc.internal.wagner.com:8443/invoke/I200118GetOrderData.imp.c1.services:GetOrderData?orderId=74427701'
10:42:19.245;[debug]; [C][RO], Client BaseAddress= 'https://ebip-wag-acc.internal.wagner.com:8443/invoke/' 
10:42:19.245;[debug]; AAA
10:42:19.250;[error]; [C][RO] Exception = Only 'http' and 'https' schemes are allowed.
Parameter name: requestUri, 
    at System.Net.Http.HttpRequestMessage.InitializeValues(HttpMethod method, Uri requestUri)
   at System.Net.Http.HttpRequestMessage..ctor(HttpMethod method, Uri requestUri)
   at System.Net.Http.HttpClient.GetAsync(Uri requestUri, HttpCompletionOption completionOption, CancellationToken cancellationToken)
   at wagnerLibrary.HttpWebRequestLaser.RO(String orderId) in C:\CWrapper\CSharpLibrary\Core\HWebRequest.cs:line 226

Viorel 122.6K Reputation points

2022-03-23T15:46:39.417+00:00

Only 'http' and 'https' schemes are allowed, but you are trying to use the 'I200118GetOrderData.imp.c1.services' scheme.
AgaveJoe 30,126 Reputation points

2022-03-23T16:14:34.29+00:00

That is the reason, but why? AAA inside log BBB not!

If the remote service threw an exception then BBB might not get hit. The code you shared does not show how exceptions are handled if handled at all. Again, you ask questions as if the community has internal knowledge of your code.

As far as I can tell, you are calling a remote invoke method and passing "I200118GetOrderData.imp.c1.services:GetOrderData?orderId=74427701" as a parameter. According the published URL specifications a colon cannot be used in a relative path. For all we know, the remote invoke method has a problem or there is a bug in the parameter. There is NO WAY for community members to know!

If you look up the error message, there's some talk about running ASP.NET in Mono and needing to upgrade Mono. I'm not sure if this is relevant but you can do a Google search and only you know the environment.
P a u l 10,761 Reputation points

2022-03-23T16:46:50.753+00:00

Btw - I'd edit your post & just remove that authorization= line from the log (if those are real credentials)
Markus Freitag 3,791 Reputation points

2022-03-23T17:31:03.063+00:00

Only 'http' and 'https' schemes are allowed, but you are trying to use the 'I200118GetOrderData.imp.c1.services' scheme.

Yes, that would explain why it works with the first customer, not here. The request looks different. What can be the cause, what can I do? Then the customer, the server must be changed? I lack the experience, what can I tell the customer?
Viorel 122.6K Reputation points

2022-03-23T18:34:37.437+00:00

Maybe 'I200118GetOrderData.imp.c1.services:GetOrderData?orderId=74427701' must be changed to 'I200118GetOrderData.imp.c1.services/GetOrderData?orderId=74427701'.
Markus Freitag 3,791 Reputation points

2022-03-26T17:05:39.267+00:00

I told the customer to try to enable the request without a colon. He's trying to change it next week. Thanks for the tip.

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C# Only http and https schemes are allowed - HttpClient

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