I cannot seem to connect to a https client using the Xamarin httpclient
I have tried various methods but the same error message always get returned
{System.Net.WebException: Error: SendFailure (Error writing headers) ---> System.Net.WebException: Error writing headers ---> System.IO.IOException: The authentication or decryption has failed.
Has anyone found a solution to this
Http Code:
HttpClient client = new HttpClient(new NativeMessageHandler());
client.BaseAddress = new System.Uri("https://....");
client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
var request = new HttpRequestMessage(HttpMethod.Post, "https://....");
var response = await client.SendAsync(request).ConfigureAwait(false);
var json = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
Related
I have an API end-point that I need to post to.
Using Postman I do the following:
Set the method to be POST
Add the URL
In the Headers I set: Content-Type to be application/json
In the Body I add my json string
I hit [Send] and get a 200 response with the expected response.
However, in C# .Net Framework 4.8 (LinqPad 5) I do
var c = new HttpClient(); // Disposed of later
c.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
string data = #"{ ""a"": ""b"", ""c"": ""d"" }"; // copied from Postman.
HttpContent payload = new StringContent(data, Encoding.UTF8, "application/json");
var msg = new HttpRequestMessage(HttpMethod.Post, new Uri("https://the.url"), UriKind.Absolute)
{
Content = payload,
};
var response = c.SendAsync(msg).GetAwaiter().GetResult(); // It's a synchronous flow
And this responds with a 502 Bad Gateway.
What am I missing...?
I should point out that I need to use the HttpClient and not RestSharp.
I am trying to create an Azure function to delete some data from a Dynamics 365 CE instance. The plan is to use the D365 WebAPI and the Batch Operations request to establish this.
Currently encountering an issue while sending a request after creating the batch request.
I have been referring to this documentation from Microsoft:
https://learn.microsoft.com/en-us/powerapps/developer/common-data-service/webapi/execute-batch-operations-using-web-api
The code looks like:
var batchId = Guid.NewGuid().ToString();
log.LogInformation($"Batch Request Id = {batchId}.");
HttpRequestMessage deleteBatchRequestMessage = new HttpRequestMessage(HttpMethod.Post, "$batch");
deleteBatchRequestMessage.Content = new MultipartContent("mixed", "batch_" + batchId);
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(d365Url);
// Default Request Headers needed to be added in the HttpClient Object
client.DefaultRequestHeaders.Add("OData-MaxVersion", "4.0");
client.DefaultRequestHeaders.Add("OData-Version", "4.0");
client.DefaultRequestHeaders.Add("Prefer", "odata.include-annotations=\"OData.Community.Display.V1.FormattedValue\"");
d365HttpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
// Set the Authorization header with the Access Token received specifying the Credentials
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", d365Token);
HttpResponseMessage response = await client.SendAsync(deleteBatchRequestMessage);
var ass = await response.Content.ReadAsStringAsync();
But I keep getting the exception:
The 'Content-Type' header is missing. The 'Content-Type' header must be specified for each MIME part of a batch message.","ExceptionMessage":"The 'Content-Type' header is missing. The 'Content-Type' header must be specified for each MIME part of a batch message."
Is there any reason why you use WebApi? You can use the SDK and the IOrganizationService handle Everything. This will make your life very easy
http://www.threadpunter.com/azure/using-azure-functions-to-call-dynamics-365/
server error:
Received non-http message from new connection
client error:
code:
var endpoint = "127.0.0.1:9000";
var accessKey = "MFQD47M******R5TZ1";
var secretKey = "WsuNQtYs********npA7iMRLjRmx";
var minio = new MinioClient(endpoint, accessKey, secretKey).WithSSL();
await minio.ListBucketsAsync();
Try removing .WithSSL(). It seems like your server is expecting plain HTTP, but your client is expecting HTTPS. First try changing the client to plain HTTP. If that works, you'd probably want to properly enable HTTPS on your server so you have a secure connection.
https://docs.minio.io/docs/how-to-secure-access-to-minio-server-with-tls
I wrote the following code in Xamarin to connect the Web Server:
var request = WebRequest.Create( "http://srv21.n-software.de/authentication.json") as HttpWebRequest;
// request.Method = "GET";
request.Method = "POST";
request.Headers.Add("name", "demo");
request.Headers.Add("password", "demo");
request.ContentType = "application/x-www-form-urlencoded";
HttpWebResponse Httpresponse = (HttpWebResponse)request.GetResponse();
It connects to the web server and the web server gets the request for "authentication.json", but doesn't get the parameters of the header ("name" and "password").
What is wrong with my code?
Most likely your parameters need to be in the body of the POST request instead of in the headers. Alternatively you might try to use a GET request instead and provide the parameters through the URL, if your server supports it (i.e. http://srv21.n-software.de/authentication.json?name=demo&password=demo).
This worked for me
using System.Net.Http;
string URL = "http://www.here.com/api/postForm.php";
string DIRECT_POST_CONTENT_TYPE = "application/x-www-form-urlencoded";
HttpClient client = new HttpClient();
string postData = "username=usernameValueHere&password=passwordValueHere");
StringContent content = new StringContent(postData, Encoding.UTF8, DIRECT_POST_CONTENT_TYPE);
HttpResponseMessage response = await client.PostAsync(DIRECT_GATEWAY_URL, content);
string result = await response.Content.ReadAsStringAsync();
I am trying to use Nuget Http client library:
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, url);
request.Headers.Add("UserAgent", "Windows 8 app client");
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
if (response.StatusCode == HttpStatusCode.OK)
return await response.Content.ReadAsStringAsync();
else
throw new Exception("Error connecting to " + url +" ! Status: " + response.StatusCode);
When I make a https request to a site that has self-signed certificate, I get 404 error. How do I set a flag to allow invalid SSL certificate in the client?