POLLY - RESILIENCY and FAULT HANDLING With HTTP Client | Getting Started With ASP.NET Core Series

[@riyazbasha7982]

Hi Rahul, I am a big fan of your fabulous content . As microservices is hot cake in the market now, I request you to please do few videos related to how and when to go for microservices , different types of database communications in microservices and cross cutting concerns in the same.

[@RahulNath]

Thank you Riyaz! Great suggestion- I’ve been planning some content around micro services architecture. Hopefully will get to it

[@lipunpatel5937]

This channel is one stop solution for .NET Core.😀

[@RahulNath]

Thank you Lipun - The ASP Series is here in case you missed it bit.ly/asp-net-core-series Do let know if you have specific topic suggestions.

[@nsajan]

Nice! Keep going Rahul.

[@RahulNath]

Thanks Sajan. Glad you are liking it!

[@kumar_codes]

Very nice ..Rahul....keep it up!! The contents of urs is very good...

[@RahulNath]

Thank you Pritish!

[@starman9000]

Great video Rahul! This kind of uniqu subject make standout from other dotnet channels! You are a Rock star 🌟

[@RahulNath]

Thank you for your continuous encouragement and support Jay!

[@ades3967]

This deserves so many more views. Great video Rahul

[@RahulNath]

Thank you, that's so kind Ade!

[@kiranshetty4316]

Superb Rahul and crystal clear . Thanks for the video. well appreciated.

[@RahulNath]

Thank you Kiran. Glad it helped!

[@1dfe-4e68-bd9f]

You explain very well. Thank you Rahul!

[@RahulNath]

So nice of you! Thank you!

[@worldisone2429]

This is urgently needed to implement in our application.... Thanks Rahul for the great video...👌

[@RahulNath]

My pleasure, Sanju 😀

[@BiffBifford]

Your shirt is just as awesome as your channel!

[@balajivenkateswarankrishna8459]

Nice Video. Appreciate your hard work in explaining it in detail. Thanks very much.

[@RahulNath]

Glad it was helpful! Hope you are enjoying the full series bit.ly/asp-net-core-series

[@ylashin78]

Nice to see the new Fiddler GUI of managing rules, in addition to Polly of course 😉

[@RahulNath]

Thank you Yousry! Yeah new Fiddler looks good, but limited features at the moment and also has a pricing plan.

[@md.ajijulhoque2190]

Thanks Rahul for the great content!!

[@RahulNath]

are you using fiddler or fiddler everywhere version? Maybe you can try setting the HttpClient.DefaultProxy explicitly. You can find more details in this post/video www.rahulpnath.com/blog/jwt_authentication_asp_net_web_api/ Lent know if that helps or if you have additional questions.

[@md.ajijulhoque2190]

@@RahulNath Thank you for providing the fix, worked by setting default proxy explicitly.

[@RahulNath]

@@md.ajijulhoque2190 Glad it helped. Let me know if you have additional questions.

[@paddymcglone9079]

Thank you for this great video !

[@RahulNath]

Glad it helped Paddy!

[@smitashirsath3998]

This video is really good. Thank you for shearing knowledge. I have one question I am not able to install Fiddler Everywhere tool on my company laptop because of privacy policies. Can you suggest me the other way to test retry and unauthorized policies for poly. Thank you

[@RahulNath]

Thank you Smita. Did you try the Fiddler standalone version? www.telerik.com/download/fiddler Might be good to check with company for exception to install this - great developer tool. Not sure of other ways to do this, could write some custom code, but haven't done that.

[@rakeshms]

very good videos Rahul.

[@RahulNath]

Thank you Rakesh and glad you like it!

[@saravanann1109]

This video is very informative.

[@RahulNath]

Glad it was helpful!

[@priyankabarde6503]

Excellent Rahul as usul

[@RahulNath]

Glad you liked it Priyanka!

[@anandvijayan710]

Good content. Thanks for putting this effort.

[@RahulNath]

Glad you enjoy it Anand! I'm sure you will like the full series here bit.ly/asp-net-core-series

[@alfullard8887]

Brilliant content. Please keep up the great work.

[@RahulNath]

Awesome thank you for the lovely comment!

[@MayankSharma-qb6hc]

Thanks a lot for your work, it really helped me.

[@RahulNath]

So happy to hear that Mayank 😀

[@jt099]

Just found your channel, great content!

[@RahulNath]

Welcome aboard Jordan and happy you are liking it. The full ASP NET Series is here kzbin.info/aero/PL59L9XrzUa-nqfCHIKazYMFRKapPNI4sP

[@jt099]

@@RahulNath Thanks going to book mark this for sure!!

[@RahulNath]

@@jt099 Will look forward to hearing from you.

[@avanirathi005]

Does circuit breaker reset per user session or for all sessions?

[@MrDonald911]

I know it's bad practice but can I use polly without a client ? Meaning I have many controller actions and each action has data logic inside (without calling an api endpoint), can I use polly as a global middleware for any request so that it applies the retry policy for any 500 response ? Thanks

[@RahulNath]

yes it will be a bad practice. You don't need polly for this, you can do exception handler and retry in side if its transient errors. If not I suggest looking at message based interaction, so you can automatically retry by reprocessing the whole message.

[@DeepakShaw]

Hey Rahul, thanks for the demo. However, I have a request to make a video on IHttpClientFactory With Delegating Handlers also cache the token in serverless scenarios. Looking forward to this..

[@RahulNath]

Hey Deepak, Thank you for your continued support here. That is a good suggestion and I have been planning to do some videos around these area of Http client. When you say cache the token are you referring to tokens used to auth with external/http api's?

[@DeepakShaw]

@@RahulNath Yes Rahul. Looking forward to your video on this topic..

[@dailystudy3984]

Thanks for your effort and turn on the translation, please

[@RahulNath]

Thank you . I have the subtitles option turned on, but looks like KZbin was unable to autogenerate for this one. If you have any specific questions feel free to ask here. Do check out the other videos in this series as well bit.ly/asp-net-core-series

[@MohammadAlbazel]

Good topic and good explanation. I really need this in our production apps. Thanks a lot Rahul👍🏻

[@RahulNath]

Glad to hear that and happy it helped. Hope you are enjoying other videos in this series bit.ly/asp-net-core-series

[@VinayKumar-cz3bu]

Great content... Simple and precise:)

[@RahulNath]

Thank you Vinay. Do check out the full series bit.ly/asp-net-core-series

[@donaldanand9563]

Why this application is not running in VS 2017. Error : "Current .ndk does not support targeting .net core 2.1."

[@FaizlMuhammed]

Short and precise, thanks Rahul for explaining well! Can you please share your Polly implementation code url.

[@RahulNath]

Thank you Faizal! Sorry missed putting it in description. Have updated it there - Here is the link rahulpnath.visualstudio.com/KZbin%20Samples/_git/MakingHttpRequest Let me know if you have any other questions.

[@FaizlMuhammed]

@@RahulNath Thanks Rahul :) , we are implementing retry in our core project, Please help to command on the below statement. 1, Request timeout and retry both are different but, we always expect a long request more than 100secs then we should set a timeout span, else all retry will fail?. how about setting an infinite time span setup. 2, When setting up a long request timeout, do we need a retry mechanism? since all our HTTP calls get an operation canceled error when added the timeout is fixed. I understand from your video the relevance of retry. Can you please help to understand the relevance of retrying HTTP call against timeout which is set up to infinite time(Client.Timeout = Timeout.InfiniteTimeSpan ) .

[@RahulNath]

@@FaizlMuhammed What's happening on that HTTP request? If it takes so long have you considered moving to a message based processing?

[@FaizlMuhammed]

@@RahulNath Hi Rahul, actually this is an Azure function,Which can be called external apis multiple times in an minute (300 calls in a day). We are getting a response in 05-150 seconds for each request.

[@RahulNath]

@@FaizlMuhammed so what is the response ? Any possibility to decouple request and response via messaging ?

[@harrylyod3402]

nice content thank you

[@RahulNath]

Thank you too Harry. I'm sure you will like the other videos in this series kzbin.info/aero/PL59L9XrzUa-nqfCHIKazYMFRKapPNI4sP

[@venkateshpillay7250]

Thank you sir.. :) One question : How can we test whether the service is retrying 3 times or not without fiddler? (i tried it but it just return 500 error at the end, so i m not sure if retry is happening or not)

[@RahulNath]

You could add some logging inside the retry and check that?

[@syedfarhan7105]

Can we configure polly in startup class itself, something like a global rule for all HttpClients?

[@RahulNath]

Hi Syed, I guess you could. Add a named client with the retry config you want and use that to resolve an instance every time. Are you facing any issues with it?

[@ammadkhan2352]

you earn subscriber man

[@RahulNath]

Thank you Ammad! Check out my ASP Series bit.ly/asp-net-core-series

[@ammadkhan2352]

@@RahulNath I will sir.

[@RahulNath]

@@ammadkhan2352 And you can call me Rahul 😀

[@RAKESHKUMAR-wv5qr]

Hi Rahul, I am planning to use polly retry in service bus topic trigger azure function when cosmos db throws exception? Can we do that?

[@RahulNath]

Yes, you can. Depends on what error cosmosdb is throwing and if it makes sense to retry. If the error is not transient, then retrying will only give you back the same error. Hope that helps.

[@RANVEER.4321]

U r a genius

[@romarathi17]

Is there any way we can implement this in asp.net 4.8 framework? Everywhere we search there are core examples but not without core. Little help would be great :-)

[@RahulNath]

Hey Roma, Yes it should be possible. You will need to get an older version thought. This link explains the version compatibility github.com/App-vNext/Polly/wiki/Supported-targets Does that help? What issue are you facing when using it? Do you have a small repo that you can share?

[@romarathi17]

@@RahulNath Actually we are yet to implement it in our project and doing some RND on that but could not find an example like you share in your video for core same as that for (without core). An example is all that is needed from where we can find a starting point. We have ample of api's and adding a code for every api will not be an optimal solution so..

[@RahulNath]

@@romarathi17 Cool makes sense. I think it will be very much the same as with the .NET core. It's been a while since I have used it with .NET fwk. But once you get to implement and if you run into issues, share me a sample repo and I can take a look.

[@FaizlMuhammed]

Hi Rahul, I have implemented policy retry in our project. One doubt if all retry did I don't want to return with an exception instead. The next line code after the HTTP call should execute. Can you please help on this.

[@RahulNath]

You can handle the exception in Polly and specify what should happen in that case - More details here github.com/App-vNext/Polly/wiki/Retry Let know if that helps.

[@abhishekks6782]

Please make a video health checks sir 🙏 like S3 using .net core

[@RahulNath]

Thank you for the suggestion. Adding to my list for Health Checks! And you can call me Rahul 😀

[@RahulNath]

Here's one on health checks kzbin.info/www/bejne/b5_Xo59pgLN2ptE

[@Tanmaygaming0406]

Hey Rahul! I noticed one stuff, I have one API which does response compression ..... Output for this api in JSON giving me in compressed form which I can't read but browser is giving me right result.... Why so? How I can resolve this?

[@RahulNath]

Hope you resolved this issue Kushal

[@Tanmaygaming0406]

Great!

[@RahulNath]

Thank you Kushal - The full series is here bit.ly/asp-net-core-series

[@Tanmaygaming0406]

@@RahulNath I've gone through your every videos!

[@RahulNath]

@@Tanmaygaming0406 Wow thank you - hope you are liking them. Do let me know in case you have any suggestions/feedback.

[@Tanmaygaming0406]

@@RahulNath Can you make something to performance of api / response compression/ microservice using ocelot or open source / you can cover on system design with implementation.

[@rajatetn92]

How can we log the retries handled by Polly?

[@RahulNath]

Is it something like this you are looking for? stackoverflow.com/questions/42952057/polly-policy-to-log-exception-and-rethrow

[@vikashsharma5777]

Bhai why so serious ? relax, you are doing great

[@RahulNath]

haha thank you Vikash. Getting better on video. Slowly getting there 😀

[@imransiddiqui6350]

voice and video is not in sync.

[@RahulNath]

Sorry to hear that - first time getting that comment. Curious are you listening on a Bluetooth headset or a wired one?

[@krishangill4137]

Make video in hindi also

[@RahulNath]

Thank you for the suggestion Krishan, but I don't speak Hindi that fluently! 😀