HttpClient.Send not supported in mac

Question

HttpClient.Send not supported in mac

Dani_S 4,501

Hi,

HttpClient.Send(request. HttpCompletionOption.ResponseHeaderRead) => not supported in mac

why? it work on windows.

Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator

2024-06-17T17:53:53.0733333+00:00

what do you mean by not supported? what error did you get?
Dani_S 4,501 Reputation points

2024-06-17T19:22:02.97+00:00

Not supported by platform
Dani_S 4,501 Reputation points

2024-06-18T07:02:59.69+00:00

     /// <summary>

        /// Send A POST request as stream to specific address in containing the value serilazed as json in reuest body

        /// <returns>Return The task object representing The asycronous opertaion</returns>

        public async Task<(Stream, string)> PostJsonAsyncReadAsStream()

        {

            if (!string.IsNullOrWhiteSpace(_token))

            {

                _client.DefaultRequestHeaders.Add("token", _token);

            }

            if (_defaultRequestHeaders != null)

            {

                foreach (KeyValuePair<string, string> defaultRequestHeader in _defaultRequestHeaders)

                {

                    _client.DefaultRequestHeaders.Add(defaultRequestHeader.Key, defaultRequestHeader.Value);

                }

            }

            //_client.Timeout = TimeSpan.FromMinutes(30);

           // _client.Timeout = TimeSpan.FromMilliseconds(Timeout.Infinite);

            _client.BaseAddress = new Uri(Constants.RequestBaseAddress);

            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "api/HandleFiles/PostDownloadFiles");

            request.Content = new FormUrlEncodedContent(new Dictionary<string, string>

            {

                 { "", _body}

            });



        //   _client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", "Base64Credetials");



             HttpResponseMessage httpResponse = _client.Send(request, HttpCompletionOption.ResponseHeadersRead); // exception throw here

            if (httpResponse.IsSuccessStatusCode)

            {

                var contentStream = await httpResponse.Content.ReadAsStreamAsync();

                if (contentStream == null )

                    return (null, null);

                var fileName = httpResponse.Content.Headers.ContentDisposition.FileName;

                return (contentStream, fileName);

            }

            return (null, null);

        }
Dani_S 4,501 Reputation points

2024-06-18T08:06:16.3666667+00:00

Your quick answer will be appreciated
Dani_S 4,501 Reputation points

2024-06-18T09:08:46.68+00:00

I got "operation not supported on this palatform"
Dani_S 4,501 Reputation points

2024-06-18T09:33:44.5266667+00:00

I try to download file from my website.
Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator

2024-06-18T19:45:19.08+00:00

the .net framework api is cross platform, meaning all entry points are defined on all platforms. but a platform need not implement all api calls, it can just throw not implemented.

you error means that that particular api is not support and probably a windows only implementation. You will need to pick an alternate. the only unsupported platform I see in HttpClient Send() is

[UnsupportedOSPlatform("browser")]

is your code Blazor?

note: httpclient code:

https://github.com/dotnet/runtime/blob/5535e31a712343a63f5d7d796cd874e563e5ac14/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs#L456

Accepted answer

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Your answer

Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator

2024-06-17T17:53:53.0733333+00:00

what do you mean by not supported? what error did you get?
Dani_S 4,501 Reputation points

2024-06-17T19:22:02.97+00:00

Not supported by platform
Dani_S 4,501 Reputation points

2024-06-18T07:02:59.69+00:00

/// <summary>

/// Send A POST request as stream to specific address in containing the value serilazed as json in reuest body

/// <returns>Return The task object representing The asycronous opertaion</returns>

public async Task<(Stream, string)> PostJsonAsyncReadAsStream()

{

if (!string.IsNullOrWhiteSpace(_token))

{

_client.DefaultRequestHeaders.Add("token", _token);

}

if (_defaultRequestHeaders != null)

{

foreach (KeyValuePair<string, string> defaultRequestHeader in _defaultRequestHeaders)

{

_client.DefaultRequestHeaders.Add(defaultRequestHeader.Key, defaultRequestHeader.Value);

}

}

//_client.Timeout = TimeSpan.FromMinutes(30);

// _client.Timeout = TimeSpan.FromMilliseconds(Timeout.Infinite);

_client.BaseAddress = new Uri(Constants.RequestBaseAddress);

HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "api/HandleFiles/PostDownloadFiles");

request.Content = new FormUrlEncodedContent(new Dictionary<string, string>

{

{ "", _body}

});

// _client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", "Base64Credetials");

HttpResponseMessage httpResponse = _client.Send(request, HttpCompletionOption.ResponseHeadersRead); // exception throw here

if (httpResponse.IsSuccessStatusCode)

{

var contentStream = await httpResponse.Content.ReadAsStreamAsync();

if (contentStream == null )

return (null, null);

var fileName = httpResponse.Content.Headers.ContentDisposition.FileName;

return (contentStream, fileName);

}

return (null, null);

}
Dani_S 4,501 Reputation points

2024-06-18T08:06:16.3666667+00:00

Your quick answer will be appreciated
Dani_S 4,501 Reputation points

2024-06-18T09:08:46.68+00:00

I got "operation not supported on this palatform"
Dani_S 4,501 Reputation points

2024-06-18T09:33:44.5266667+00:00

I try to download file from my website.
Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator

2024-06-18T19:45:19.08+00:00

the .net framework api is cross platform, meaning all entry points are defined on all platforms. but a platform need not implement all api calls, it can just throw not implemented.

you error means that that particular api is not support and probably a windows only implementation. You will need to pick an alternate. the only unsupported platform I see in HttpClient Send() is

[UnsupportedOSPlatform("browser")]

is your code Blazor?

note: httpclient code:

https://github.com/dotnet/runtime/blob/5535e31a712343a63f5d7d796cd874e563e5ac14/src/libraries/System.Net.Http/src/System/Net/Http/HttpClient.cs#L456

Answer 1

Michael Taylor 60,161

You're trying to use the sync version of the method. Sync methods, in general, are not recommended. For Mac you must use the async version (SendAsync).

//HttpResponseMessage httpResponse = _client.Send(request, HttpCompletionOption.ResponseHeadersRead); 
HttpResponseMessage httpResponse = await _client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);

You can read more here about why this decision was made but honestly nobody uses Send anyway and you're in the middle of an async all so there is no reason to use the sync version.

Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator

2024-06-18T23:54:09.1233333+00:00

originally .net core only supported async I/O, but for compatability with porting from the old framework, many of the sync versions have been added.
Dani_S 4,501 Reputation points

2024-06-20T07:33:13.0233333+00:00

It fixed,

but on content stream I got :

error parsing 'variable' request. Unknown Error 0X80131

HttpResponseMessage httpResponse = await _client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead); // exception throw here

            if (httpResponse.IsSuccessStatusCode)

            {

                var contentStream = await httpResponse.Content.ReadAsStreamAsync();

                if (contentStream == null )//error parsing 'variable' request. Unknown Error 0X80131

                    return (null, null);

                var fileName = httpResponse.Content.Headers.ContentDisposition.FileName;

                return (contentStream, fileName);

            }
Michael Taylor 60,161 Reputation points

2024-06-20T13:58:53.1566667+00:00

You're going to have to debug that one using a breakpoint. The error doesn't make sense to me and it almost looks like a bad message.

Off the top of my head I'm wondering if the status response is 204 which means there is no body to read. Since we have no visibility into the call you're making or what it is doing we cannot say for certain but by putting a breakpoint on the send, executing the request and then looking at what is sent back. The status code tells you whether it was successful or not and the headers will tell you what data was received (if any).

Note that your if (contentStream == null) probably will never do anything. If you call ReadAsStreamAsync you're going to get a Stream back or it is going to fail. Hence the check is not useful. You really need to confirm that you got data before you try to read the stream. Again, check the status code (204 means no data) and potentially the content length. Depending upon the API you're calling they may return back 204 if the file cannot be found although I would normally expect a 404. Note also that status code isn't success (2xx range) then whatever code is after this block will run. If that is an error case for you then instead of checking the status code just call EnsureSuccessStatusCode and it'll throw an error if the call had failed. Otherwise you're responsible for handling errors.
Dani_S 4,501 Reputation points

2024-06-20T16:20:41.84+00:00

Still got this error parsing 'variable' request. Unknown Error 0X80131500

After i fixed to _client.SendAsync()
Dani_S 4,501 Reputation points

2024-06-21T09:46:10.84+00:00

the code before works in windows but not in mac,
Dani_S 4,501 Reputation points

2024-06-21T09:58:15.9+00:00

Still got this error parsing 'variable' request. Unknown Error 0X80131500

After i fixed to _client.SendAsync()
Dani_S 4,501 Reputation points

2024-06-23T09:59:45.1866667+00:00

it download file with zero bytes length.
Dani_S 4,501 Reputation points

2024-06-23T10:32:12.34+00:00

where is the problem in request or response ?
Dani_S 4,501 Reputation points

2024-06-23T12:07:45.7066667+00:00

this error parsing 'variable' request. Unknown Error 0X80131500 come from vs code.
Michael Taylor 60,161 Reputation points

2024-06-23T23:06:01.4666667+00:00

You need to check the status code that is coming back from the request. If it is 204 then there is no data to download. ReadStreamAsync simply returns a stream wrapping the content body. If there is no body then there is nothing to stream.

Since we have no knowledge of the API you're calling we cannot tell you how to handle their responses. You should refer to their documentation. Additionally you should look at the actual content in the debugger as it'll show you a lot more information including the headers. The content length and content type tell you what they sent you. If it doesn't line up with what you expect then there is a problem. Again, we have no way of knowing any of this. Clean up your code and post back the status code, content headers and what happens as you step through the code. Please do not simply run your code and look at the return value of your function, you need to step through it line by line.
Dani_S 4,501 Reputation points

2024-06-24T03:33:10.3266667+00:00

Thanks a lot. It works now.

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HttpClient.Send not supported in mac

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