Server-Sent Events or SSE is when the server sends events to the client in a unidirectional manner. In this video I explain Server-Sent Events and compare it to websockets and HTTP and Long Polling.   Source Code https://github.com/hnasr/javascript_playground/tree/master/server-sent-events  Resources https://developer.mozilla.org/en-US/docs/Web/API/EventSource   0:00 Intro 1:50 HTTP 1.0/1.1 3:40 WebSockets 5:00 Server Sent Events 7:30 SSE Use Cases 9:00 SSE Code Example 18:00 SSE Pros & Cons 25:20 Do You Need SSE? 28:30 Summary

In this video I go through all possible ways the US can use to block TikTok?  0:00 Intro 0:22 App Stores 1:30 DNS 2:20 ISP Level Block  3:30 DOH/ DOT 5:00 SNI  5:50 VPN

This is a question from one of you guys that I thought I'd answer in its own video since its loaded.  Q/A - Shark Beak I currently have the same setup for my side project. What do you think about having a 'create table if not exist' running on startup that creates this table? Good/bad?    It is always a good idea to have a specific database user for each route with specific permissions and use connection pooling as much as possible.

ZeroMQ is an Open Source Messaging Library designed for a high-performance asynchronous messaging library. In this video I discuss this tech and build a simple queue with this tech

0:00 Intro

1:48 What is ZeroMQ?

4:48 Messaging Patterns

6:42 Socket Types

8:55 Simple Queue

11:00 Code

23:20 ZeroMQ Pros & Cons

29:30 Summary

Source Code

https://github.com/hnasr/javascript_playground/tree/master/zeromq-simplequeue

Resources

https://github.com/booksbyus/zguide/tree/master/examples/Node.js

https://en.wikipedia.org/wiki/ZeroMQ

https://blog.scottlogic.com/2015/03/20/ZeroMQ-Quick-Intro.html

http://zguide.zeromq.org/page:chapter3#advanced-request-reply

Outline

Discussing Layer 7 Reverse Proxy D=DOS Mitigation (Security Now Video by Steve Gibson )

Google Chrome and Firefox to Join Apple’s Safari in One Year Certificate Validity (My opinion)

TCP Fast Open Spec https://tools.ietf.org/html/rfc7413#section-1

In this video I discuss what is the TCP Slow Start and its effect on performance of backend applications, proxies and even frontend applications.

In this video, I explain why we can't run unencrypted HTTP/2 or HTTP/3 without enabling TLS. This is because of Protocol Ossification.

Article: Why Turning on HTTP/2 Was a Mistake - Lucidchart - https://www.lucidchart.com/techblog/2019/04/10/why-turning-on-http2-was-a-mistake/  In this video I discuss this article and my opinion.  That is not a limitation of HTTP/2 but of the application that couldn't handle the request. It is like driving a volvo all your life and then switching to a Ferrari and saying it was a mistake because its too fast. I disagree with the solutions of throttling the LB and I think the app should either be architected to not send this much requests if possible or just add more servers since HTTP is stateless you should be able to scale. HTTP/2 however does use more cpu it is dealing with many streams. The article doesn’t explain if it was H2 all the way though or not.    0:00 Intro 1:17 HTTP/1.1 Current Architecture  4:00 What happened when They Enabled HTTP/2 AT LB 7:00 Why I disagree with the throttling  8:00 Proposed Solutions  12:15 Why HTTP/2 can be CPU intensive   Card at minute 3 playlist http2   🏭 Backend Engineering Videos https://www.youtube.com/playlist?list=PLQnljOFTspQUNnO4p00ua_C5mKTfldiYT  💾 Database Engineering Videos https://www.youtube.com/playlist?list=PLQnljOFTspQXjD0HOzN7P2tgzu7scWpl2  🛰 Network Engineering Videos https://www.youtube.com/playlist?list=PLQnljOFTspQUBSgBXilKhRMJ1ACqr7pTr  🏰 Load Balancing and Proxies Videos https://www.youtube.com/playlist?list=PLQnljOFTspQVMeBmWI2AhxULWEeo7AaMC  🐘 Postgres Videos  https://www.youtube.com/playlist?list=PLQnljOFTspQWGrOqslniFlRcwxyY94cjj  🚢Docker https://www.youtube.com/playlist?list=PLQnljOFTspQWsD-rakNw1C20c1JI8UR1r  🧮 Programming Pattern Videos  https://www.youtube.com/playlist?list=PLQnljOFTspQV1emqxKbcP5esAf4zpqWpe  🛡 Web Security Videos https://www.youtube.com/playlist?list=PLQnljOFTspQU3YDMRSMvzflh_qXoz9zfv  🦠 HTTP Videos https://www.youtube.com/playlist?list=PLQnljOFTspQU6zO0drAYHFtkkyfNJw1IO  🐍 Python Videos https://www.youtube.com/playlist?list=PLQnljOFTspQU_M83ARz8mDdr4LThzkBKX  🔆 Javascript Videos  https://www.youtube.com/playlist?list=PLQnljOFTspQWab0g3W6ZaDM6_Buh20EWM  👾Discord Server https://discord.gg/CsFbFce  Become a Member  https://www.youtube.com/channel/UC_ML5xP23TOWKUcc-oAE_Eg/join  Support me on PayPal https://bit.ly/33ENps4  Become a Patreon https://www.patreon.com/join/hnasr?  Stay Awesome, Hussein