.NET Microservices eBook is being updated to .NET Core 2.1 "wave" of technologies!

[CESARDELATORRE]

The .NET Microservices eBook is being updated to .NET Core 2.1 "wave" of technologies!

Main subjects/chapters updated:

• HttpClientFactory + Polly for resilient Http communication in .NET Core 2.1
• API Gateways and implementation with Ocelot
• Minor updates related to .NET Core 2.1 versions, packages and Docker images

Download from: https://aka.ms/microservicesebook

Note that this is still an on-going effort, hence the version "v2.1.01".

In the upcoming weeks it'll be updated in a few more topics and the version will be updated to the next minor versions, such as "v2.1.01", "v2.1.02", etc.

But we think the community appreciates having sooner updates in the guidance instead of a single big update coming later.

[Sn3b]

Great news! Would you please also update the ePub and mobi versions?

[ayayalar]

	+1
	
	

	Arif

On Mon, Jun 18, 2018 at 11:08 PM -0700, "Sebastien de Salvador" [email protected] wrote:

Great news! Would you please also update the ePub and mobi versions too?

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[maulikk2000]

hi Cesar,

great news. Thanks for updating the book.

I have a quick question about how to add HttpClientHandler object to client factory. In .net core 2.0, it was easy to create object of HttpClientHandler and add it to the HttpClient but as things have changed now, couldnt find an easier way to do it in .net core 2.1.

The reason I want HttpClientHandler added to the HttpClient is, I went to one of the MS Kubernetes OpenHack events here in Sydney and one of the tasks was to create an API to replace KubeCtl. So I created a .net core 2.1 application ( source code at https://github.com/maulikk2000/openhack ) but on hitting GET on KubeController, getting " Internal Server Error The remote certificate is invalid according to the validation procedure" error. One of the suggestions from MS team was to use HttpClientHandler's ServerCertificateCustomValidationCallback method , but as things have changed in 2.1, there wasnt any easy way to do it. We thought of using typed client, but it was proving bit challenging. So just want to know, is there any easy already backed way of using it, or will have to take a bit different approach and create a Typed Client and add HttpClientHandler there.

Thanks, Maulik Khandwala

On Tue, Jun 19, 2018 at 9:40 AM Cesar De la Torre [email protected] wrote:

The .NET Microservices eBook is being updated to .NET Core 2.1 "wave" of technologies!

Main subjects/chapters updated:

**- HttpClientFactory + Polly for resilient Http communication in .NET Core 2.1

• API Gateways and implementation with Ocelot
• Minor updates related to .NET core 2.1 versions, packages and Docker images**

Download from: https://aka.ms/microservicesebook [image: image] https://user-images.githubusercontent.com/1712635/41567367-ae6ebe58-7314-11e8-92e8-439698e8919a.png

Note that this is still an on-going effort, hence the version "v2.1.01".

In the upcoming weeks it'll be updated in a few more topics and the version will be updated to the next minor versions, such as "v2.1.01", "v2.1.02", etc.

But we think the community appreciates to have sooner updates in the guidance instead of a single big update coming later.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/dotnet-architecture/News/issues/17, or mute the thread https://github.com/notifications/unsubscribe-auth/AEsZoJRemAAJEmwykl2KLNS7v9So5Iatks5t-DptgaJpZM4UsonK .

[CESARDELATORRE]

@sn3b @ayayalar - The eReaders (mobi and epub) versions will be updated in the upcoming weeks, ok? :)

[CESARDELATORRE]

@maulikk2000 - Is there any reason why you cannot use HttpClientFactory in .NET Core 2.1 for your scenario? - That’s the recommended way to use HttpClient so it re-uses the pool of handlers plus it is easi r to use policies. If possible, use HttpClientFactory, either with typed clients, named clients or even directly. Take a look to the section about HttpClientFactory in the eBook and also to the references I put about HttpClientFactory. If you had issues, tell me so we’ll look for further possibilities, ok? :)

[ayayalar]

	Thank you Cesar!!!
	

	Arif

On Tue, Jun 19, 2018 at 7:41 PM -0700, "Cesar De la Torre" [email protected] wrote:

@Sn3b @ayayalar - The eReaders (mobi and epub) versions will be updated in the upcoming weeks, ok? :)

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[maulikk2000]

Hi Ceasar,

thanks for the prompt reply.

Actually I am using HttpClientFactory in my API ( source code at https://github.com/maulikk2000/openhack ) . But my problem is " Internal Server Error The remote certificate is invalid according to the validation procedure" and to overcome in dev I need to use ServerCert ificateCustomValidationCallback which returns true and that method is on HttpClientHandler.

Excerpt from my startup.cs

services.AddHttpClient("openhackAPI", client => {

            var uri = "http://127.0.0.1:8080/";
            client.BaseAddress = new Uri(uri);
            client.DefaultRequestHeaders.Add("Accept",

"application/json"); client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", bearerToken); });

Controller

public async Task<IActionResult> Get() { var client = _httpClientFactory.CreateClient("openhackAPI");

        var data = await

client.GetAsync("api/v1/namespaces/default/services"); return Ok(data);

    }

In .net core 2.0 I could write like (from https://stackoverflow.com/questions/38138952/bypass-invalid-ssl-certificate-in-net-core )

using (var httpClientHandler = new HttpClientHandler()){ httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; }; using (var client = new HttpClient(httpClientHandler)) { // Make your request... }}

But I couldnt find a similar way in HttpClientFactory to do it.

Basically my question is, how do I use ServerCert ificateCustomValidationCallback with HttpClientFactory?

thanks, Maulik

On Wed, Jun 20, 2018 at 12:46 PM Cesar De la Torre [email protected] wrote:

@maulikk2000 https://github.com/maulikk2000 - Is there any reason why you cannot use HttpClientFactory in .NET Core 2.1 for your scenario? - That’s the recommended way to use HttpClient so it re-uses the pool of handlers plus it is easi r to use policies. If possible, use HttpClientFactory, either with typed clients, named clients or even directly. Take a look to the section about HttpClientFactory in the eBook and also to the references I put about HttpClientFactory. If you had issues, tell me so we’ll look for further possibilities, ok? :)

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[onizet]

var clientBuilder = services.AddHttpClient("openhackAPI", client => { ... });
clientBuilder.ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler() {
   ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
});

Btw, I'm curious about your Bearer token and its lifetime (unless this is an offline_token). I forward the call to another internal server by providing the received bearer token, with the use of a MessageHandler:

var clientBuilder = services.AddHttpClient("openhackAPI", client => { ... })
      .AddHttpMessageHandler<BearerTokenHandler>();

/// <summary>
/// Provides the Bearer authentication header from the current caller.
/// </summary>
sealed class BearerTokenHandler : DelegatingHandler
{
     private readonly IHttpContextAccessor httpContextAccessor;

     public BearerTokenHandler(IHttpContextAccessor httpContextAccessor)
     {
         this.httpContextAccessor = httpContextAccessor;
     }

     protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
         CancellationToken cancellationToken)
     {
         var context = httpContextAccessor.HttpContext;
         if (context.Request.Headers.TryGetValue("Authorization", out StringValues bearer))
             request.Headers.Authorization = AuthenticationHeaderValue.Parse(bearer.ToString());

         return await base.SendAsync(request, cancellationToken);
     }
}

[sashcatk]

Re: [dotnet-architecture/News] .NET Microservices eBook is being updated to .NET Core 2.1 "wave" of technologies! (#17)

What the fuck ?

Вы писали 20 июня 2018 г., 13:42:20:

var clientBuilder = services.AddHttpClient("openhackAPI", client => { ... }); clientBuilder.ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler() {    ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator }); Btw, I'm curious about your Bearer token and its lifetime (unless this is an offline_token). I forward the call to another internal server by providing the received bearer token, with the use of a MessageHandler: var clientBuilder = services.AddHttpClient("openhackAPI", client => { ... })

     .AddHttpMessageHandler<BearerTokenHandler>();

///

/// Provides the Bearer authentication header from the current caller.

///

sealed class BearerTokenHandler : DelegatingHandler

{

    private readonly IHttpContextAccessor httpContextAccessor;

    public BearerTokenHandler(IHttpContextAccessor httpContextAccessor)

    {

        this.httpContextAccessor = httpContextAccessor;

    }

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,

        CancellationToken cancellationToken)

    {

        var context = httpContextAccessor.HttpContext;

        if (context.Request.Headers.TryGetValue("Authorization", out StringValues bearer))

            request.Headers.Authorization = AuthenticationHeaderValue.Parse(bearer.ToString());

        return await base.SendAsync(request, cancellationToken);

    }

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-- Зайцев Александр                        mailto:[email protected]

[maulikk2000]

awesome..

thanks for the help. It works like a charm. It's the thing what I was after.

thanks heaps, Maulik

On Wed, Jun 20, 2018 at 6:41 PM Olivier Nizet [email protected] wrote:

var clientBuilder = services.AddHttpClient("openhackAPI", client => { ... });clientBuilder.ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler() { ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator });

Btw, I'm curious about your Bearer token and its lifetime (unless this is an offline_token). I forward the call to another internal server by providing the received bearer token, with the use of a MessageHandler:

var clientBuilder = services.AddHttpClient("openhackAPI", client => { ... }) .AddHttpMessageHandler<BearerTokenHandler>(); ///

/// Provides the Bearer authentication header from the current caller.///

sealed class BearerTokenHandler : DelegatingHandler { private readonly IHttpContextAccessor httpContextAccessor;

 public BearerTokenHandler(IHttpContextAccessor httpContextAccessor)
 {
     this.httpContextAccessor = httpContextAccessor;
 }

 protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
     CancellationToken cancellationToken)
 {
     var context = httpContextAccessor.HttpContext;
     if (context.Request.Headers.TryGetValue("Authorization", out StringValues bearer))
         request.Headers.Authorization = AuthenticationHeaderValue.Parse(bearer.ToString());

     return await base.SendAsync(request, cancellationToken);
 }

}

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[CESARDELATORRE]

@onizet @maulikk2000 - Right, comment from @onizet about setting the PrimaryHandler is how you must configure HttpClientHandler.

There's some more info here: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/http-requests?view=aspnetcore-2.1#configure-the-httpmessagehandler

I told the ASP.NET team that we should have some further documentation bout this topic. 👍