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The RIGHT Way To Use HttpClient In .NET 

Milan Jovanović
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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
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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

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9 июл 2024

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Комментарии : 127   
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Get the source code for this video for FREE → the-dotnet-weekly.ck.page/httpclient
@balakrishnan-gf9rw
@balakrishnan-gf9rw 8 месяцев назад
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..
@vibes992000
@vibes992000 Год назад
Must awaited video. Thanks.
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Hope you enjoyed it!
@ArnonDanon
@ArnonDanon Год назад
Great content as always Milan...thank you🤴🏻
@MilanJovanovicTech
@MilanJovanovicTech Год назад
You're welcome!
@csegyud
@csegyud Год назад
It was a nicely built overview. Thank you!
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Glad you liked it!
@davearkley7014
@davearkley7014 Год назад
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
@zfold4702 Год назад
Where is your post?
@metaltyphoon
@metaltyphoon Год назад
Strongly typed and singletons have problems, so watch out.
@davearkley7014
@davearkley7014 Год назад
@@zfold4702 ?
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Named clients are awesome
@hamitkarahan2973
@hamitkarahan2973 Год назад
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
@PippiTheLongSock Год назад
I think you shouldn't manually dispose the instance. I am pretty sure the framework does that automatically.
@MilanJovanovicTech
@MilanJovanovicTech Год назад
I agree, if it works don't fix it. Right?
@hamitkarahan2973
@hamitkarahan2973 Год назад
@@MilanJovanovicTech Yesss 😁
@niezebenmansour3736
@niezebenmansour3736 Год назад
Thank you for the effort in this video!
@MilanJovanovicTech
@MilanJovanovicTech Год назад
You're welcome :)
@astroGTC
@astroGTC Год назад
Great !! keep the good work !
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Thanks, will do!
@kodindoyannick5328
@kodindoyannick5328 5 месяцев назад
Very good content! Thanks Milan.
@MilanJovanovicTech
@MilanJovanovicTech 4 месяца назад
You're very welcome!
@mylesdavies9476
@mylesdavies9476 Год назад
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
@MilanJovanovicTech Год назад
I think it's better to do the common things inside of AddHttpClient
@mylesdavies9476
@mylesdavies9476 Год назад
@@MilanJovanovicTech fair enough, any particular reason?
@JUTO_MTL
@JUTO_MTL Год назад
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
@JamesSecretofski
@JamesSecretofski Год назад
Thanks for the infiniteTimeSpan. Cool tip 👍
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Don't mention it 😁
@toragodzen
@toragodzen Год назад
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
@MilanJovanovicTech Год назад
They're slightly different, cant' say one is better than the other
@Javilingys
@Javilingys 8 месяцев назад
What about using Transient HttpClient service inside Scoped Services? Its ok?
@MilanJovanovicTech
@MilanJovanovicTech 8 месяцев назад
No scoped services were used here
@vishalsaini-py4yd
@vishalsaini-py4yd Год назад
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
@MilanJovanovicTech Год назад
You can use a delegating handler for each client
@d3vil5oldier
@d3vil5oldier Год назад
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
@jaomartins1994 Год назад
Infra
@MilanJovanovicTech
@MilanJovanovicTech Год назад
HttpClient could lead you to place it in Infrastructure You could create an interface in Application, however
@Lazzerman42
@Lazzerman42 Год назад
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
@MilanJovanovicTech Год назад
I am not sure, to be completely honest
@user-sy8ld9be8j
@user-sy8ld9be8j 9 месяцев назад
Great Video Milan! Do you have a video showing how you would unit test this pls? (unit test IHttpClientFactory).
@MilanJovanovicTech
@MilanJovanovicTech 9 месяцев назад
I don't yet, sadly. But I would take a look at MockHttp: github.com/richardszalay/mockhttp
@wdorsett84
@wdorsett84 Год назад
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
@Sanabalis Год назад
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
@MilanJovanovicTech Год назад
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
@diogosilva3637
@diogosilva3637 Год назад
Great explantion! Will you make a tutorial about Refit? Thanks!
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Perhaps, I like that library. Maybe to compare it with HttpClient
@Ram92026z
@Ram92026z Год назад
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
@MilanJovanovicTech Год назад
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
@ramprahalad5579 Год назад
@@MilanJovanovicTech , got it! It is that oldish pattern of using the HttpClient I guess. Thanks a lot!
@pmsivakumar
@pmsivakumar 10 месяцев назад
How do you do when you need to fetch the access token dynamically and refresh when it expires with this approach?
@MilanJovanovicTech
@MilanJovanovicTech 10 месяцев назад
Check this out: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_u6v4D6qgDI.html You need a DelegatingHandler on top of the HttpClient
@DrHeinzDoofenshmirtz
@DrHeinzDoofenshmirtz 9 месяцев назад
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
@MilanJovanovicTech 9 месяцев назад
MSFT recommendation: learn.microsoft.com/en-us/dotnet/fundamentals/networking/http/httpclient-guidelines
@grm360
@grm360 Год назад
Nice content as always! Could you make a video on how to use Swagger documentation with minimal api?
@MilanJovanovicTech
@MilanJovanovicTech Год назад
What's to be covered there?
@ershadnozari
@ershadnozari Год назад
You can inject a httpclientfactory instead of httpclient in a typed client to get around the singleton issue.
@MilanJovanovicTech
@MilanJovanovicTech Год назад
What's the point of using a typed client then?
@johntotetwoo
@johntotetwoo 11 месяцев назад
great video but I am wondering how you can configure with token that expires?
@MilanJovanovicTech
@MilanJovanovicTech 11 месяцев назад
DelegatingHandler
@elfatel
@elfatel Год назад
Thanks
@MilanJovanovicTech
@MilanJovanovicTech Год назад
You're welcome!
@haskell3702
@haskell3702 11 месяцев назад
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
@MilanJovanovicTech 11 месяцев назад
Check this out: github.com/skwasjer/MockHttp
@KhinSandarMyint-eq2ks
@KhinSandarMyint-eq2ks 8 месяцев назад
May I know how to add dynamic certificate using HttpClientFactory ? I have to use different certs.
@MilanJovanovicTech
@MilanJovanovicTech 8 месяцев назад
learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/methods-auto/httpclient/httpclient-addcertificate-method
@ALOKSHARMAMD
@ALOKSHARMAMD 11 месяцев назад
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
@MilanJovanovicTech 11 месяцев назад
Yes - you'd end up creating too many handler instances. You want it to be long-lived
@DavideSansoni
@DavideSansoni 8 дней назад
Great Video!! Just a curiosity: what VS theme are you using? Looks very clean
@MilanJovanovicTech
@MilanJovanovicTech 8 дней назад
It's ReSharper
@DavideSansoni
@DavideSansoni 8 дней назад
@@MilanJovanovicTech thank you 🙏🏻
@pitthp
@pitthp 4 месяца назад
What is good configuration for PooledConnectionLifeTime for Integration test project, that have a hundred test with API calls?
@MilanJovanovicTech
@MilanJovanovicTech 4 месяца назад
How long does it take for your test suite execute?
@VascoFernandesBuenoJunior
@VascoFernandesBuenoJunior Год назад
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
@MilanJovanovicTech Год назад
Will do, great suggestion
@juke-duke
@juke-duke Год назад
What if you make the typed client a static class with a static HttpClient?
@MilanJovanovicTech
@MilanJovanovicTech Год назад
That works cool, since clients should be long-lived (at least the underlying message handler)
@floralb5317
@floralb5317 11 месяцев назад
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
@MilanJovanovicTech 11 месяцев назад
I would explore an option of using a DelegatingHandler, to access Key Vault or SQL and get the configuration value.
@lucid111lucid
@lucid111lucid 5 месяцев назад
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
@MilanJovanovicTech 5 месяцев назад
"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.
@AmirHashemZadeh
@AmirHashemZadeh Год назад
well done
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Thanks!
@WDGKuurama
@WDGKuurama Год назад
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
@MilanJovanovicTech Год назад
A new instance of which class?
@semen083
@semen083 Год назад
It is need to add "using" for httpClient, received from IhttpClientFactory?
@MilanJovanovicTech
@MilanJovanovicTech Год назад
No need, it'll be garbage collected
@codingbloke
@codingbloke Год назад
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
@MilanJovanovicTech Год назад
You'd configure the services separately
@codingbloke
@codingbloke Год назад
@@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
@bahmansani3408
@bahmansani3408 Год назад
why can not find video about creating read models eventualy with eventual consistency?
@MilanJovanovicTech
@MilanJovanovicTech Год назад
It's a recent video, look for Materialized views
@coder3123
@coder3123 5 месяцев назад
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
@MilanJovanovicTech 5 месяцев назад
You can either create a request object, and set the header. Or set the DefaultRequestHeaders on the HttpClient
@pigrebanto
@pigrebanto 4 месяца назад
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
@MilanJovanovicTech 4 месяца назад
Use a delegating handler
@VijayKumar-wy9ku
@VijayKumar-wy9ku Год назад
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
@MilanJovanovicTech Год назад
Well if you want to 10 _DIFFERENT_ named clients, you have no other choice
@nanvlad
@nanvlad Год назад
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
@TheMichaelos Год назад
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
@MilanJovanovicTech Год назад
In theory, it shouldn't work - because no HttpClient would be wired up for that service
@palpie
@palpie Год назад
You should show the strongly typed version using an interface instead.
@MilanJovanovicTech
@MilanJovanovicTech Год назад
You don't need interfaces for everything 🤷‍♂️
@adriancamposteixeira5483
@adriancamposteixeira5483 Год назад
why not the "using" or "dispose"?
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Not needed
@user-tk2jy8xr8b
@user-tk2jy8xr8b Год назад
It's a pity that AddHttpClient forces you to use service locator pattern
@MilanJovanovicTech
@MilanJovanovicTech Год назад
You win some, you lose some
@zfold4702
@zfold4702 Год назад
Now extend this for clients that need to send Jwt Token in headers with refresh token capability
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Will do, that requires Delegating Handlers
@thecodeman_
@thecodeman_ Год назад
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
@zfold4702 Год назад
Where is your post?
@MilanJovanovicTech
@MilanJovanovicTech Год назад
Yes!
@Cesar-qi2jb
@Cesar-qi2jb 9 месяцев назад
If it was true, nothing wrong with this.
@PauloMorgado
@PauloMorgado 9 месяцев назад
You forgot to dispose the clients.
@MilanJovanovicTech
@MilanJovanovicTech 9 месяцев назад
You would only need to do it in the first example
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