What happens before the Backend gets the Request

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Күн бұрын

When we send a request to a backend most of us focus on the processing aspect of the request which is really just the last step.
There is so much more happening before a request is ready to be processed, most of this step happens in the Kernel. I break this into 6 steps, each step can theoretically be executed by a dedicated thread or process. Pretty much all backends, web servers, proxies, frameworks and even databases have to do all these steps and they all do choose to do it differently.
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0:00 Intro
3:50 What is a Request?
10:14 Step 1 - Accept
21:30 Step 2 - Read
29:30 Step 3 - Decrypt
34:00 Step 4 - Parse
40:36 Step 5 - Decode
43:14 Step 6 - Process
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Пікірлер: 77

@hnasr 2 ай бұрын

Fundamentals of Operating Systems course oscourse.win

@gneyhabub 11 ай бұрын

Finally, someone who's going beyond just explaining the API of the libraries! Don't stop man, you're making great content!

@stormsake 11 ай бұрын

Second this. Many others only copy paste codes without knowing what happens behind the scenes.

@shalabyx 11 ай бұрын

Amazing walkthrough 👏 I can’t imagine how this would look if you explain all this steps by using one use case! Anyway it’s just amazing 🌹

@shyampramanik780 11 ай бұрын

This is GOLD !! Thanks Hussein for this amazing content.

@AdekunleLawal 24 күн бұрын

So happy the algorithm brought this channel my way. Love the deep dives Hussein does 👏🏽

@mauriciotamez4047 11 ай бұрын

There is so much knowledge here. ILYSM Hussein

@CodeShode 11 ай бұрын

Listen at 1.75 speed.

@barebears289 11 ай бұрын

2.0x

@rosshoyt2030 11 ай бұрын

1.0x

@prerakhere 10 ай бұрын

Slow is smooth. Smooth is fast.

@adhilk2775 4 ай бұрын

Thank you....

@iamansinghrajpoot 8 ай бұрын

I see lot of KZfaqrs just scratch the surface and people comment you are the best. I like how thorough and detailed explanation you do.

@hnasr 11 ай бұрын

Grab my new course Discovering Backend Bottlenecks: Unlocking Peak Performance performance.husseinnasser.com

@pramod1591 11 ай бұрын

Your channel is a gold mine of information

@prateek2159 11 ай бұрын

I missed your long videos. This one was a fab. Please keep making more such videos

@ahmetyasarozer 11 ай бұрын

Perfect content, as usual. Thanks Hussein

@user-ok4fx3kl6f 11 ай бұрын

This is by far the best thing on internet! you're amazing!

@arthurmiller9103 11 ай бұрын

This session is conceptually loaded and well explained. Thank you 🙏

@sohansingh2022 11 ай бұрын

this helps me in my basics so much!

@cumbi-mongo 9 ай бұрын

Great content as always! Thanks a lot.

@gustavodeoliveira8316 11 ай бұрын

you are a game changer. thanks for that man

@hassanmunene5406 11 ай бұрын

Just last week we were doing an assignment on how to create a client-server architecture for a simple program That echo the requests from the client using sockets. We were using the c programming language and it was really interesting to learn how actually a server listens and accepts request and how it forks so as a to handle different clients while at the same time listening. This was what i needed to reinforce what i learnt and i felt really proud that i was actually understanding some concepts you were talking about. Im just a beginner in this field but i have so much fire and curiosity about the backend. I totally enjoyed this.!!❤

@othmanalyusifey356 11 ай бұрын

that makes sense , can i know where u get this assinement from ? is it from a course or the collage

@hassanmunene5406 11 ай бұрын

@@othmanalyusifey356 yeah it's from college. The unit is called Network programming

@leoxvic4701 9 ай бұрын

@@othmanalyusifey356most likely a network engineering assignment for unix networking programming

@abc-ym4zs 5 ай бұрын

Where to learn this socket programming cab u recommend any good channel and where to learn about cpu and OS please bro I am facing difficulty

@sonugupta147 4 ай бұрын

@@abc-ym4zs there is something as linux programmer's manual document. This contains all the system calls provided by the linux/unix OS which you can utilise to interact with the kernel i.e. ask for resources like memory, I/O, networking etc.

@abdullahclementabdulshekur6736 3 ай бұрын

I'm transitioning into backend from frontend and i wanted to learn and understand high and low level concept before building projects. and your courses have been very helpful. The netowking, backend and database engineering concepts.. have been really helpful to me. I do have a request though, a course on systems design would be great. Keep doing the good work..

@timeisnow1100 3 ай бұрын

Great video

@VincentDBlair 11 ай бұрын

Great material

@sourav_singh_diaries 5 ай бұрын

Crazy Good content 🔥

@lakshaybhardwaj5923 11 ай бұрын

Thanks a lot for such amazing teachings. It has been really helpful to me.. You are the best!! However I have a question regarding this walkthrough.. How does this complete setup and 4 queues (SYN, ACCEPT, RECEIVE, SEND) behave when there are many concurrent HTTP requests vs when there are many web socket connections (or long lived connections like SSE ) ?

@aviadhaham 11 ай бұрын

you’re an asset to the world

@dannyhd8301 11 ай бұрын

Thank you .

@giggleways 11 ай бұрын

Watching this I released more dopamine than watching a Netflix movie. ♥

@fashionvella730 6 ай бұрын

Same here i am just consuming his content at night like i am watching NetFlix

@RichardHumulock 11 ай бұрын

Hussein is such a bad ass

@renanoliveira0 11 ай бұрын

Thanks!

@karanyuvrajsingh4911 11 ай бұрын

Respect your cpu🫡

@mhmdshaaban 7 ай бұрын

You are the best Hussein. I have a question as we keep accepting connections inside a single process it will open a new file descriptor where reading and writing happen there is always a limitation to the number of open files per process even though this number is configurable it is hard to determine what is the reasonable number.

@manindersingh5577 11 ай бұрын

Hi sir can you tell me…if my computer is attacked with ransomware and photos and videos are encrypted…can the hackers use my photos and videos? Can they see them and import them?

@pieter5466 11 ай бұрын

To anyone watching this, I purchased and am partway thru 3 of Hussein's Udemy courses and they're great! Same quality walkthroughs but on a much wider variety topics. Only feedback would be: more evenly timed videos (some are 50mins..) and less digression off-current-topic.

@mehdi-vl5nn 11 ай бұрын

what about non-block socket

@pajeetsingh 11 ай бұрын

You have to cover superconductor at room temp ongoing reports.

@samirallahverdi4948 9 ай бұрын

Couldn't imagine these process in containerized environment :)

@ericstoppel4634 11 ай бұрын

ily Hussein, keep it up please. This is like steroids to my backend carreer

@RiversJ 6 ай бұрын

Great videos, i hopped from game dev doing lower levels where you didn't just need to understand the lower APIs but the hardware architecture to a point, in web dev you need to spend many times more effort to even just get a poorly explained abstraction of what the thing below you is doing much less a good lesson on the technology. Not everybody needs to be capable of lower lower coding, but I'm firmly of the opinion that understanding the layer below you is necessary to become truly good.

@ryanseipp6944 11 ай бұрын

The io_uring part gets very interesting. Why call `accept` a bunch when you can have the kernel accept new connections automatically, and tell you about it. Why copy data on `recv` when you can have the kernel choose a buffer you've registered and tell you which one it chose. Even without these, that IO model is quite efficient when compared to epoll

@samhadi7972 11 ай бұрын

It’s a game changer

@adr420 2 ай бұрын

bro is in love with computer science :)

@sauraabh 11 ай бұрын

Can I create a blog out of this video? I'll give you the credits

@GuilhermeGavioli 11 ай бұрын

Is there any book reference for the tcp / network part you mentioned on the video? To help understand tcp protocol better.

@gauravaws20 11 ай бұрын

TCP Illustrated.

@GuilhermeGavioli 11 ай бұрын

@@gauravaws20 By W. Richard Stevens?

@gauravaws20 11 ай бұрын

@@GuilhermeGavioli yup

@AwadA-ey7pn 8 ай бұрын

I feel like a Staff level Software Engineer now 🎉🎉

@meassurendra 11 ай бұрын

Dude , great content. But please use some pictures, diagrams to drive message through. It gets very difficult to sit through after a while

@florianvanbondoc3539 6 ай бұрын

The best bottleneck youtube channel :))))

@tekforge 3 ай бұрын

Hey Hussein, I really love the great content you share and how you share it! I'm also a senior software engineer who started a YT channel a few years ago and have 2 Udemy courses that I would love to dedicate more time to them to share more of what I learned in my career. Yet, it takes me a lot of effort to create content with the quality I'm satisfied with. When I see inspiring content creators like you, I wonder if you produce your content as a side hustle or if it's your full-time job. I see how you reflect and analyze things in order to understand them deeper and share lessons, but I notice also that the pressure in our full-time job as software engineers often doesn't give us enough time to reflect, analyze then share knowledge about what we learned. I appreciate your feedback regarding your own experience as an engineer and content creator!

@usmanmaqsood5945 4 ай бұрын

Thank you for making things understandable for dumb developers like me :)

@bashardlaleh2110 11 ай бұрын

you're like the only arab guy I'm proud of 😁

@dannyhd8301 11 ай бұрын

just when i thought i am good backend lol

@IshwarJangid 11 ай бұрын

Starts at @04:00

@btm1 8 ай бұрын

its called abstraction, not closing your eyes

@alisadeghi6410 11 ай бұрын

this video forcing me to write a simple backend framework to feel with my skin what is happening exactly

@orhn 11 ай бұрын

"Kenekşın"

@AlhassanRaad 11 ай бұрын

hello

@AlhassanRaad 11 ай бұрын

new

@nibblesnbits 11 ай бұрын

First!

@gradientO 11 ай бұрын

17 year old account 💪

@vijaydhanakodi5591 11 ай бұрын

This guy should speak with some energy.

@giggleways 11 ай бұрын

I like the way he talks. it gives me time to think along the way.

@RichardHumulock 11 ай бұрын

He does? lol.He speaks naturally.

@arpmovies3609 11 ай бұрын

It's useless knowledge, cause you will never have to use it or have to know to become backed developers. 😅😅😅😅 He just read a blog about a topic and thought 🤔 to make a video of it.

@RichardHumulock 11 ай бұрын

to be a good one you need to know it lol

@arpmovies3609 11 ай бұрын

@@RichardHumulock you are absolutely wrong. To be a good backend developer you need to know backend topics (db, concurrency, caching etc..) not os related topics which is a waste of time. It might sound cool all of this but trust me you will never have to use it in your life as a backend developer