The Backend Engineering Show with Hussein Nasser

In this video I explain how I was browsing a website (displate) and was served the exact same thing on my Instagram feed

Watch the Video here  https://youtu.be/76sgBHUl7iI Alessandro Ghedini wrote an interesting article discussing how DNS queries can help speed up HTTPS and HTTP/3 communication let us discuss this article https://blog.cloudflare.com/speeding-up-https-and-http-3-negotiation-with-dns/ 3:30 TLS video https://www.youtube.com/watch?v=AlE5X1NlHgg 4:57 HSTS https://www.youtube.com/watch?v=kYhMnw4aJTw...

On September 28 2020 Microsoft 365 Service went down, what caused it? and what did Microsoft did to solve it. Resources https://twitter.com/msft365status/status/1310696819135901696?s=21 https://status.office.com/ https://answers.microsoft.com/en-us/msoffice/forum/msoffice_account-mso_imobile-mso_o365b/error-aadsts90033/d2ba3ef2-fe85-411d-b4fe-5c44df1e121c https://answers.microsoft.com/en-us/msoffi...

In this video I explain how communication protocols are built on top of each other and how each protocol can be stateful or stateless. We need to understand this in order to know which protocol to use to build the right backend. 

It looks like Russia is submitting a proposal to block TLS 1.3, ESNI, DoH , DoT, let us discuss  Resources  https://www.zdnet.com/article/russia-wants-to-ban-the-use-of-secure-protocols-such-as-tls-1-3-doh-dot-esni/  https://en.wikipedia.org/wiki/SORM

What scared me about this bug is how EASY it is to execute, no MITM, no special software.. its all exploiting of existing software.. Let us discuss   The SSDP engine in Firefox for Android (68.11.0 and below) can be tricked into triggering Android intent URIs with zero user interaction.  This attack can be leveraged by attackers on the same WiFi network and manifests as applications...

Google Bot is now attempting to use HTTP/2 to crawl the web Ever since mainstream browsers started supporting the next major revision of HTTP, HTTP/2 or h2 for short, web professionals asked us whether Googlebot can crawl over the upgraded, more modern version of the protocol. Today we're announcing that starting mid November 2020, Googlebot will support crawling over HTTP/2 fo...

In this video, I explain how I got better at communicating my thoughts, opinions and ideas and how making content on YouTube Channel actually helped. I still have a long way but I found that making content and continuously trying to get better at delivering the core point helps.

There was a recent article titled Stop Using React which spawned lots of discussions. I want to give my thoughts on this article and React in general.   Resources https://dev.to/ender_minyard/why-you-should-stop-using-react-g7c  https://timkadlec.com/remembers/2020-04-21-the-cost-of-javascript-frameworks/   0:00 Intro 3:20 Its Slow 8:30 Its expensive 12:00 its inaccessible...

In this video, I discuss 3 methods to work with tables of billion rows. This discussion is inspired by a comment on my YouTube video on Twitter System Design right here https://www.youtube.com/watch?v=gfq-LG9ZJQA&lc=UgyYbm5889dW0XtKhsV4AaABAg Chapters Intro 0:00 1. Brute Force Distributed Processing 2:30 2. Working with a Subset of table 3:35 2.1 Indexing 3:55 2.2 Partitioning 5:30 2.3 Shardin...

It seems like these incidents are very common and not sure why ElasticSearch in particular. Let us discuss      https://www.zdnet.com/article/leaky-server-exposes-users-of-dating-site-network/

Some of you asked me how to deal with stress at my work and my content creation here on YouTube I share my thoughts with you Intro 0:00 Stress from Work 2:40 Feeling down with no clear reason 7:13 Feeling anxious overwhelmed with stuff to learn 14:55 Pandemic 21:14

Unimog is a layer 4 load balancer built for Cloudflare scale. Cloudflare has written a great blog about it so let us discuss this technology. Video: https://youtu.be/Q0irm6xzNNk Resources https://blog.cloudflare.com/unimog-cloudflares-edge-load-balancer/ 0:00 Intro 3:33 Layer 4 vs Layer 7 Load Balancers 7:00 Anycast 13:45 Packet Forwarding 23:30 XDP and Network stack 26:45 Maintaining established...

Jake Miller a security researcher discovered a serious flaw in proxies that allow h2c clear text upgrade and bypass proxy rules. Let us discuss Thanks to @Textras for sending this article! https://twitter.com/thebumblesec/status/1303305853525725184?s=21 https://labs.bishopfox.com/tech-blog/h2c-smuggling-request-smuggling-via-http/2-cleartext-h2c?hs_amp=true

Apache Kafka is an interesting software, every design decision the team makes perfect sense. I decided to dive deep into the discussion of the consumer group concept which is underrated and talk more about it. 0:00 Intro 1:24 Messaging Systems Explained 3:30 Partitioning 4:30 Pub/Sub vs Queue 6:55 Consumer Group 10:00 Parallelism in Consumer Group 10:30 Partition awareness in Consumer Group 11:30...

Someone asked me a question and I felt its interesting to make a video about, is there a limit to the maximum number of TCP connections a Client can make to the server? If there is what is it? and how does that make sense in all the configurations? 0:00 Intro 1:00 Is there a Max Connection Limit? 4:30 64K Connection Limit Explained 7:20 Max Connections on Reverse Proxies and Max Connections 14:30...

Doordash the food delivery service has built an asynchronous task processing backend with Celery and RabbitMQ. They are having lots of outages and problems. Let us discuss how they solved their problem by moving to Apache Kafka. Very well written article. Resource https://doordash.engineering/2020/09/03/eliminating-task-processing-outages-with-kafka/ https://www.rabbitmq.com/connections.html#high-...

Application-Layer  Protocol Negotiation  ( ALPN ) is a  Transport Layer Security  (TLS) extension that allows the application layer to negotiate which  protocol  should be performed over a secure connection in a manner that avoids additional round trips and which is independent of the application-layer protocols. It is needed by secure  HTTP/2  connections,...

In this video I explain when to use TCP vs UDP as a communication protocol on your backend app. I go through the advantages and disadvantages of UDP I also discuss the protocol within the context of Chatting System, Multiplayer game, and building a browser and a web server   0:00 Intro 2:00 UDP 3:00 TCP 6:00 UDP vs TCP for Building a Chatting System  9:20 UDP vs TCP for Building a M...

HTTP/2 is a protocol that allows multiplexing which can be very beneficial however HTTP/2 is not always cheap and might not be a good choice for your backend. * Intro 0:00 * What is HTTP/2 ? 1:30 * HTTP/2 Pros 5:10 * HTTP/2 Advantages on Browsers 5:30 * HTTP/2 Advantages on Reverse Proxy Connection Pooling 9:20 * HTTP/2 Problem 11:00 Google Talk https://www.youtube.com/watch?v=xxN4FfwaANk

Envoy is an open-source L7 proxy and communication bus Originally built at Lyft to move their architecture away from a monolith. In this video, I want to go through the following * What is Envoy? 0:00 * Current & Desired Architecture 0:48 * Envoy Architeture 3:00 * DownStream/Upstream 7:30 * Clusters 9:19 * Listeners 10:50 * Network Filters 11:50 * Connection Pools 13:45 * Threading Model...

Envoy Proxy is an L3/L4 Proxy that is designed to be service mesh, In this video, I discuss my initial thoughts about the product, design choices, and much more. The actual full video on Envoy will be coming soon stay tuned.

In this video, I explain Postgres Vacuum while I walk my dog.

Cloudflare is doing fantastic job to the web community security and backend engineering. This latest fix is awesome it is the ability to auto-tune window size buffer when it comes to uploading HTTP/2 traffic. Article https://blog.cloudflare.com/delivering-http-2-upload-speed-improvements/ 4:15 slow tcp start https://www.youtube.com/watch?v=rgPcxg8gjho&t=1s 5:40 HTTP crash course https://www.youtub...

SameSite Cookie Lax is interesting and we are finding new exceptions everyday. Let us discuss this one where lax cookies will be sent on POST request as long as the cookies are fresh (2 minutes) Resources https://www.chromestatus.com/feature/5088147346030592