The RIGHT Way To Use HttpClient In .NET

No video

The RIGHT Way To Use HttpClient In .NET

Рет қаралды 56,048

Күн бұрын

Get the source code for this video for FREE → the-dotnet-wee...
☄️ Master the Modular Monolith Architecture: bit.ly/3SXlzSt
📌 Accelerate your Clean Architecture skills: bit.ly/3PupkOJ
🚀 Support me on Patreon to access the source code: / milanjovanovic
The easy way to make HTTP requests in .NET is to use the HttpClient to send those requests. And it's a great abstraction to work with, especially with the methods supporting JSON payloads and responses. Unfortunately, it's easy to misuse the HttpClient. Port exhaustion and DNS behavior are some of the most common problems. So in this video, I'll show what you need to know about working with HttpClient correctly.
The Right Way To Use HttpClient In .NET
www.milanjovan...
Join my weekly .NET newsletter:
www.milanjovan...
Read my Blog here:
www.milanjovan...
Subscribe for more:
/ @milanjovanovictech
Chapters
0:00 The naive way to use HttpClient
1:10 Why is this a problem?
2:05 Using the IHttpClientFactory
3:34 Adding configurability with named clients
5:54 Strong typing with typed clients
9:17 Why you should avoid typed clients in Singleton services

Пікірлер: 142

@MilanJovanovicTech Жыл бұрын

Get the source code for this video for FREE → the-dotnet-weekly.ck.page/httpclient Want to master Clean Architecture? Go here: bit.ly/3PupkOJ Want to unlock Modular Monoliths? Go here: bit.ly/3SXlzSt

@balakrishnan-gf9rw 9 ай бұрын

Hi Milan, I have a correlation Id in my web api. I used typed http client in mvc core 6 application. So in that case how to pass x-correlation Id in all my web API from client. Kindly suggest me..

@davearkley7014 Жыл бұрын

I've been using named clients, but like the idea of strongly typed clients so may try them out. One advantage of being able to apply configuration once is that you can add Polly retry policies and they will be used for all instances of the named/typed client.

@zfold4702 Жыл бұрын

Where is your post?

@metaltyphoon Жыл бұрын

Strongly typed and singletons have problems, so watch out.

@davearkley7014 Жыл бұрын

@@zfold4702 ?

@MilanJovanovicTech Жыл бұрын

Named clients are awesome

@michaelchudinov 22 күн бұрын

Well explained and practical oriented step by step tutorial. Thank you!

@MilanJovanovicTech 22 күн бұрын

Glad you enjoyed it!

@hamitkarahan2973 Жыл бұрын

Last part was very nice Milan. Many thanks. I preferred named clients many times in projects. I didn't prefer typed clients because I was a little afraid to delve into this lifetime issues when my services are singleton. I am just basically calling CreateClient method in my infra layer with a using() block. This approach didn't give me any problem so far in production.

@PippiTheLongSock Жыл бұрын

I think you shouldn't manually dispose the instance. I am pretty sure the framework does that automatically.

@MilanJovanovicTech Жыл бұрын

I agree, if it works don't fix it. Right?

@hamitkarahan2973 Жыл бұрын

@@MilanJovanovicTech Yesss 😁

@mylesdavies9476 Жыл бұрын

Nice, have been working with typed clients for a while and find it to be a good approach. The only thing I do differently is inject configuration into the typed client and assign any required headers with the constructor, keeping the configure services nice and clean.

@MilanJovanovicTech Жыл бұрын

I think it's better to do the common things inside of AddHttpClient

@mylesdavies9476 Жыл бұрын

@@MilanJovanovicTech fair enough, any particular reason?

@JUTO_MTL Жыл бұрын

I do exactly the same because i didnt figure out how to retrieve configuration with Option Pattern. I get null from the IConfiguration inside the HttpClient Configuration method. If someone have any idea

@ArnonDanon Жыл бұрын

Great content as always Milan...thank you🤴🏻

@MilanJovanovicTech Жыл бұрын

You're welcome!

@niezebenmansour3736 Жыл бұрын

Thank you for the effort in this video!

@MilanJovanovicTech Жыл бұрын

You're welcome :)

@JamesSecretofski Жыл бұрын

Thanks for the infiniteTimeSpan. Cool tip 👍

@MilanJovanovicTech Жыл бұрын

Don't mention it 😁

@csegyud Жыл бұрын

It was a nicely built overview. Thank you!

@MilanJovanovicTech Жыл бұрын

Glad you liked it!

@vibes992000 Жыл бұрын

Must awaited video. Thanks.

@MilanJovanovicTech Жыл бұрын

Hope you enjoyed it!

@Javilingys 9 ай бұрын

What about using Transient HttpClient service inside Scoped Services? Its ok?

@MilanJovanovicTech 9 ай бұрын

No scoped services were used here

@ershadnozari Жыл бұрын

You can inject a httpclientfactory instead of httpclient in a typed client to get around the singleton issue.

@MilanJovanovicTech Жыл бұрын

What's the point of using a typed client then?

@diogosilva3637 Жыл бұрын

Great explantion! Will you make a tutorial about Refit? Thanks!

@MilanJovanovicTech Жыл бұрын

Perhaps, I like that library. Maybe to compare it with HttpClient

@kodindoyannick5328 6 ай бұрын

Very good content! Thanks Milan.

@MilanJovanovicTech 6 ай бұрын

You're very welcome!

@astroGTC Жыл бұрын

Great !! keep the good work !

@MilanJovanovicTech Жыл бұрын

Thanks, will do!

@user-sy8ld9be8j 10 ай бұрын

Great Video Milan! Do you have a video showing how you would unit test this pls? (unit test IHttpClientFactory).

@MilanJovanovicTech 10 ай бұрын

I don't yet, sadly. But I would take a look at MockHttp: github.com/richardszalay/mockhttp

@AyoJAjayi 19 күн бұрын

Thanks for this lesson

@MilanJovanovicTech 18 күн бұрын

My pleasure!

@coder3123 6 ай бұрын

If I were to call API2 from my API1 and the API2 accepts the bearer token that API1 call has is there a way to pass that as header using this method?

@MilanJovanovicTech 6 ай бұрын

You can either create a request object, and set the header. Or set the DefaultRequestHeaders on the HttpClient

@toragodzen Жыл бұрын

Hi, great video! I've just subscribed and I want to ask about the difference between the EShop and Gatherly projects, which one is better to learn from?

@MilanJovanovicTech Жыл бұрын

They're slightly different, cant' say one is better than the other

@palpie Жыл бұрын

You should show the strongly typed version using an interface instead.

@MilanJovanovicTech Жыл бұрын

You don't need interfaces for everything 🤷‍♂️

@Lazzerman42 Жыл бұрын

Thanks! Very well explained and clear code examples! I use the RestSharp for know - because it has support for oAuth1(I need it for an old smartHome device). Are there any helpers for oAuth1 and HttpClient?

@MilanJovanovicTech Жыл бұрын

I am not sure, to be completely honest

@VascoFernandesBuenoJunior Жыл бұрын

O think you need to make another video explaining how to add retry using Polly. I recomend to use Backoff.DecorrelatedJitterBackoffV2 in this case.

@MilanJovanovicTech Жыл бұрын

Will do, great suggestion

@d3vil5oldier Жыл бұрын

That's exactly what i was looking for, thanks Milan. Just one question, where do you think those typed clients belong to - Application layer or whatever?

@jaomartins1994 Жыл бұрын

Infra

@MilanJovanovicTech Жыл бұрын

HttpClient could lead you to place it in Infrastructure You could create an interface in Application, however

@grm360 Жыл бұрын

Nice content as always! Could you make a video on how to use Swagger documentation with minimal api?

@MilanJovanovicTech Жыл бұрын

What's to be covered there?

@pitthp 6 ай бұрын

What is good configuration for PooledConnectionLifeTime for Integration test project, that have a hundred test with API calls?

@MilanJovanovicTech 6 ай бұрын

How long does it take for your test suite execute?

@KhinSandarMyint-eq2ks 10 ай бұрын

May I know how to add dynamic certificate using HttpClientFactory ? I have to use different certs.

@MilanJovanovicTech 10 ай бұрын

learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/methods-auto/httpclient/httpclient-addcertificate-method

@pigrebanto 6 ай бұрын

ok but what if the token expires and you need to renew it / pass-in it again? to me it seems that with Factory approach you configure it statically at application startup phase.

@MilanJovanovicTech 6 ай бұрын

Use a delegating handler

@VijayKumar-wy9ku Жыл бұрын

If I'm using 10 different named clients, then 10 object of HttpClient is created using IHttpClientFactory. How can we configure a single instance of HttpClient throughout whole application?

@MilanJovanovicTech Жыл бұрын

Well if you want to 10 _DIFFERENT_ named clients, you have no other choice

@WDGKuurama Жыл бұрын

What i don't understand i why does it hate to make a new instance of the class injecting the httpclient if we could have a singleton do avoid being garbage collected all the time, is there issues with such techniques?

@MilanJovanovicTech Жыл бұрын

A new instance of which class?

@vishalsaini-py4yd Жыл бұрын

Great video....can you please tell how I can configure multiple http client having different token mechanism and adding different authorisation header in each separate request.

@MilanJovanovicTech Жыл бұрын

You can use a delegating handler for each client

@johntotetwoo Жыл бұрын

great video but I am wondering how you can configure with token that expires?

@MilanJovanovicTech Жыл бұрын

DelegatingHandler

@pmsivakumar 11 ай бұрын

How do you do when you need to fetch the access token dynamically and refresh when it expires with this approach?

@MilanJovanovicTech 11 ай бұрын

Check this out: kzfaq.info/get/bejne/ldtmqZd1m9fLdH0.html You need a DelegatingHandler on top of the HttpClient

@wdorsett84 Жыл бұрын

Great video! Thank you! Just to confirm when using named clients, the concern over transient vs singleton lifestyles isn't a concern? It's just with typed clients?

@Sanabalis Жыл бұрын

Correct. Since you use a factory to create the named client inside the method each time you invoke it, the lifetime of the class instance is not a factor at all. This is true only if the named client is created inside the method. However, should you create (and capture) named clients inside the constructors, you will effectively introduce the same issues as when using the typed client. Capture the factory instead.

@MilanJovanovicTech Жыл бұрын

Yes, since with named clients you create an instance and dispose of it. If you capture the client in a field, you have a similar issue

@DrHeinzDoofenshmirtz 10 ай бұрын

Is the last solution for types clients with the lifetime settings a valid and good approach to use? or is it more on the hacky side? I have never stumpled upon it, and I knew almost everything else in the video. Though it was much more well explained than I have read.

@MilanJovanovicTech 10 ай бұрын

MSFT recommendation: learn.microsoft.com/en-us/dotnet/fundamentals/networking/http/httpclient-guidelines

@nanvlad Жыл бұрын

What if I just call AddHttpClient() and inject HttpClient into services contstructors? Do they share the same instance or every service gets its own copy?

@TheMichaelos Жыл бұрын

I wanted to ask the same question! @MilanJovanovicTech I would really appreciate if you could elaborate on differences between factory injection and direct client injection 🙏

@MilanJovanovicTech Жыл бұрын

In theory, it shouldn't work - because no HttpClient would be wired up for that service

@haskell3702 Жыл бұрын

Awesome explanation , but I have a doubt how can I Mock the http call using the typed approach? I mean, I want to write a test for GetByUserNameAsync method where the internal httpClient simulates returning 200 and a predefined json

@MilanJovanovicTech Жыл бұрын

Check this out: github.com/skwasjer/MockHttp

@ALOKSHARMAMD Жыл бұрын

you said using httpclient in traditional way can exhaust ports in long run, but is this true if we are doing proper dispose by applying using statements?

@MilanJovanovicTech Жыл бұрын

Yes - you'd end up creating too many handler instances. You want it to be long-lived

@semen083 Жыл бұрын

It is need to add "using" for httpClient, received from IhttpClientFactory?

@MilanJovanovicTech Жыл бұрын

No need, it'll be garbage collected

@DavideSansoni Ай бұрын

Great Video!! Just a curiosity: what VS theme are you using? Looks very clean

@MilanJovanovicTech Ай бұрын

It's ReSharper

@DavideSansoni Ай бұрын

@@MilanJovanovicTech thank you 🙏🏻

@bahmansani3408 Жыл бұрын

why can not find video about creating read models eventualy with eventual consistency?

@MilanJovanovicTech Жыл бұрын

It's a recent video, look for Materialized views

@EvgeniyYatsenko 7 күн бұрын

great stuff!

@MilanJovanovicTech 7 күн бұрын

Thanks!

@codingbloke Жыл бұрын

Typed clients has too many gotcha's. In addition to the messy stuff you added at the end, what if you have multiple services that require the same HttpClient configuration? I just used named configurations and only inject the factory, simples.

@MilanJovanovicTech Жыл бұрын

You'd configure the services separately

@codingbloke Жыл бұрын

@@MilanJovanovicTech Indeed but then what you would have is all that malarkey to provide a specific configuration of a HttpClient which is only ever used by a single type and that type's only job is to wrap a specific configuration of HttpClient. In that case again you might as well have that service type do all that work. It would take the factory and what other config services it needed, and have a private method that returns a configured HttpClient

@Ram92026z Жыл бұрын

Hi @Milan. This was an absolute great video and I am learning a ton from this channel and so, thank you. Hey, how can I use the above method (the 3rd way you describe in the above video) if I am working off of a class library project and I need to use httpClient within it. Basically, all my API calls are in a class library project. Is there an optimal way of using httpClient in it because I am worried about port exhaustion? Thanks

@MilanJovanovicTech Жыл бұрын

If you can create one HttpClient, pass it a SocketsHttpHandler instance at creation with some connection lifetime, and store it in a static field so that it's long-lived - that should suffice

@ramprahalad5579 Жыл бұрын

@@MilanJovanovicTech , got it! It is that oldish pattern of using the HttpClient I guess. Thanks a lot!

@juke-duke Жыл бұрын

What if you make the typed client a static class with a static HttpClient?

@MilanJovanovicTech Жыл бұрын

That works cool, since clients should be long-lived (at least the underlying message handler)

@lucid111lucid 6 ай бұрын

My use case is a DLL which will be used with a winforms program. I expect that my DLL will be called periodically (hourly) and occasionally for a short burst of http activity. What video do you have that might help me choose the best implementation method? /Rob

@MilanJovanovicTech 6 ай бұрын

"short burst of http activity" - it doesn't look like you can do much harm whichever implementation you opt for. You could create a static HttpClient in the DLL and reuse it.

@floralb5317 Жыл бұрын

Hello Milan, Thank you for amazing content. Something is bothering me regarding the configurations you need for a HttpClient. Let's say that you have some configuration stored in Azure Key Vault/Azure SQL Database, and each incoming request to our API has some kind of x-clientId header, how would you handle creating named HttpClient or strong typing HttpClient after retrieving some metadata on Azure Key Vault/Azure SQL? Thank you, keep up the good work :)

@MilanJovanovicTech Жыл бұрын

I would explore an option of using a DelegatingHandler, to access Key Vault or SQL and get the configuration value.

@AmirHashemZadeh Жыл бұрын

well done

@MilanJovanovicTech Жыл бұрын

Thanks!

@elfatel Жыл бұрын

Thanks

@MilanJovanovicTech Жыл бұрын

You're welcome!

@adriancamposteixeira5483 Жыл бұрын

why not the "using" or "dispose"?

@MilanJovanovicTech Жыл бұрын

Not needed

@sanilkumarn.s8974 17 күн бұрын

Hello, Is it possible to inject httpclient in .net framework 4.8?

@MilanJovanovicTech 17 күн бұрын

Yes, I believe it's available in .NET Framework (and recommended)

@MahmoudSaed98 19 күн бұрын

why didn't you use Try - Catch to Handle Exceptions that may occur

@MilanJovanovicTech 19 күн бұрын

Didn't need it for this example

@user-tk2jy8xr8b Жыл бұрын

It's a pity that AddHttpClient forces you to use service locator pattern

@MilanJovanovicTech Жыл бұрын

You win some, you lose some

@zfold4702 Жыл бұрын

Now extend this for clients that need to send Jwt Token in headers with refresh token capability

@MilanJovanovicTech Жыл бұрын

Will do, that requires Delegating Handlers

@Alaa_vie 23 күн бұрын

Whats the difference between HttpClient and WebClient?

@MilanJovanovicTech 23 күн бұрын

WebClient is obsolete and shouldn't be used: learn.microsoft.com/en-us/dotnet/api/system.net.webclient?view=net-8.0

@Alaa_vie 7 күн бұрын

@@MilanJovanovicTech thank you

@chairmakerPete 5 күн бұрын

I'm sticking to Blazor Server 😂

@MilanJovanovicTech 4 күн бұрын

Why's that?

@thecodeman_ Жыл бұрын

Admit that you saw my post a few minutes ago, and in 20 minutes you recorded a 12-minute video, edited and uploaded it. Just admit it, I'll forgive you..

@zfold4702 Жыл бұрын

Where is your post?

@MilanJovanovicTech Жыл бұрын

Yes!

@Cesar-qi2jb 10 ай бұрын

If it was true, nothing wrong with this.