VAK

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)

Here is a scenario of cyclic sending messages and receiving responses via slowStatsChannel.
The transport accepts all 5 responses, but only the first 3 responses that meet the 10s interval are displayed on the console, as seen in DevTools.
My understanding is that a packet transaction has a lifetime, after which the packets are accepted but are not passed to the processing script. This is a tricky disconcerting point for those who are new to real-time network programming.

1 comment

/book-real-time-phoenix #suggestion

0 445 1

2023-01-05 15:06:11 UTC

First Post!

sb8244

Author of From Ruby to Elixir and Real-Time Phoenix

Just to clarify, do you mean this lifetime is implemented in Phoenix JS lib, or somewhere else?

The packets transmitted over the channel’s WebSocket are not delayed at all. It’s the request/response lifecycle that’s delayed inside of the Channel’s logic (via Process.sleep). So, when a message is sent, it’s going to be sent as fast as possible from client → server and server → client.

WebSocket itself does not have the concept of request/response lifecycle, so that’s all implemented by Phoenix’s libraries.

Post #2

Where Next?

View thread on forum

View Real Time Phoenix's book portal

Post errata for this book

Post a suggestion for this book

Post a question about this book

Post a review about this book

Home PragProg Customers

/book-real-time-phoenix #suggestion

0 445 1

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

Warnings in Python Testing With Pytest Chapter 2

Python Testing With Pytest - Chapter 2, warnings for “unregistered custom marks” While running the smoke tests in Chapter 2, I get these...

#pragprog #errata /book-python-testing-with-pytest

5 2081 1

2020-07-27 19:33:14 UTC

New

PragProg Customers

A Common-Sense Guide to Data Structures and Algorithms, Second Edition: (pg460)

Hello! Thanks for the great book. I was attempting the Trie (chap 17) exercises and for number 4 the solution provided for the autocorre...

#errata /book-a-common-sense-guide-to-data-structures-and-algorithms-second-edition

0 1157 3

2023-03-10 05:02:03 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: File not Found Error (page 43)

I ran this command after installing the sample application: $ cards add do something --owner Brian And got a file not found error: Fil...

#errata /book-python-testing-with-pytest-second-edition

5 4391 7

2021-07-03 13:51:08 UTC

New

PragProg Customers

Hands-on Rust: Adequate docs for bracket_lib

I’m new to Rust and am using this book to learn more as well as to feed my interest in game dev. I’ve just finished the flappy dragon exa...

#question /book-hands-on-rust

5 1516 3

2021-07-15 19:29:13 UTC

New

PragProg Customers

Build a Weather Station with Elixir and Nerves: Problem connecting to Postgres with Grafana

Title: Build a Weather Station with Elixir and Nerves: Problem connecting to Postgres with Grafana on (page 64) If you follow the defau...

#errata /book-build-a-weather-station-with-elixir-and-nerves

0 1962 4

2021-11-16 04:25:39 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: error when installing editable package (page 178)

When installing Cards as an editable package, I get the following error: ERROR: File “setup.py” not found. Directory cannot be installe...

#errata /book-python-testing-with-pytest-second-edition

0 1739 1

2021-12-10 05:12:55 UTC

New

PragProg Customers

Powerful Command-Line Applications in Go: Exercise Solutions (many pages)

Is there any place where we can discuss the solutions to some of the exercises? I can figure most of them out, but am having trouble with...

#question /book-powerful-command-line-applications-in-go

17 1396 9

2022-02-09 15:00:31 UTC

New

PragProg Customers

Programming Phoenix LiveView: Live Upload Match Error

Book: Programming Phoenix LiveView, page 142 (157/378), file lib/pento_web/live/product_live/form_component.ex, in the function below: d...

#errata /book-programming-phoenix-liveview

7 1158 10

2023-01-26 13:23:12 UTC

New

PragProg Customers

PragProg Customers Kotlin and Android Development: pg. 8 Build Gradle error: Could not get unknown property 'kotlin_version'

I am using Android Studio Chipmunk | 2021.2.1 Patch 2 Build #AI-212.5712.43.2112.8815526, built on July 10, 2022 Runtime version: 11.0....

#question /book-kotlin-and-android-development-featuring-jetpack

0 1456 2

2022-08-29 14:30:50 UTC

New

PragProg Customers

Hands-on Rust: Chapter 3: Can't get first hello to run

Hello @herbert ! Trying to get the very first “Hello, Bracket Terminal!" example to run (p. 53). I develop on an Amazon EC2 instance runn...

#question /book-hands-on-rust

0 1147 2

2025-01-07 19:49:45 UTC

New

Other popular topics

General Dev>Hardware

Which keyboard do you have?

If it’s a mechanical keyboard, which switches do you have? Would you recommend it? Why? What will your next keyboard be? Pics always w...

#hardware /keyboards #sticky #mechanical-keyboards

144 9115 50

2021-01-07 23:58:36 UTC

New

Game Dev>Learning Resources

The Ray Tracer Challenge

Brace yourself for a fun challenge: build a photorealistic 3D renderer from scratch! In just a couple of weeks, build a ray tracer that r...

pragprog.com

#pragprog #published-book /book-the-ray-tracer-challenge #algorithms

3 6115 0

2020-09-22 14:26:56 UTC

New

General Dev>Learning Resources

Forge Your Future with Open Source

Free and open source software is the default choice for the technologies that run our world, and it’s built and maintained by people like...

pragprog.com

#pragprog #published-book /book-forge-your-future-with-open-source

3 5654 0

2020-04-21 18:37:36 UTC

New

General Dev>Learning Resources

Seven More Languages in Seven Weeks

Learn from the award-winning programming series that inspired the Elixir language, and go on a step-by-step journey through the most impo...

pragprog.com

#pragprog /elixir /julia /lua #published-book #factor /elm #minikanren /idris /book-seven-more-languages-in-seven-weeks

4 5862 0

2020-04-29 21:59:54 UTC

New

Backend>Learning Resources

Testing Elixir

Write Elixir tests that you can be proud of. Dive into Elixir’s test philosophy and gain mastery over the terminology and concepts that u...

pragprog.com

#pragprog /elixir #published-book /book-testing-elixir

33 5004 8

2021-01-05 06:17:50 UTC

New

Linux>Questions

What is the most minimalist Linux server distro?

I am asking for any distro that only has the bare-bones to be able to get a shell in the server and then just install the packages as we ...

#linux #servers

66 25846 24

2022-04-13 13:30:03 UTC

New

General Dev>Dev Chat

The V Programming Language

The V Programming Language Simple language for building maintainable programs V is already mentioned couple of times in the forum, but I...

#programminguages /v

21 13874 7

2021-04-12 15:13:42 UTC

New

General Dev>Dev Chat

PragProg’s Medium Posts

Hello everyone! This thread is to tell you about what authors from The Pragmatic Bookshelf are writing on Medium.

#pragprog #blog-post

1147 29994 760

2025-07-10 13:36:16 UTC

New

Community>In The Spotlight

Spotlight: Mike Riley (Author) Interview and AMA!

Author Spotlight Mike Riley @mriley This month, we turn the spotlight on Mike Riley, author of Portable Python Projects. Mike’s book ...

#author-spotlight /python #iot /book-portable-python-projects #internet-of-things

62 7035 19

2022-06-09 14:01:01 UTC

New

Backend>Official News

Node.js v22.14.0 released!

Node.js v22.14.0 has been released. Link: Release 2025-02-11, Version 22.14.0 'Jod' (LTS), @aduh95 · nodejs/node · GitHub

github.com

/nodejs #official-news

0 4251 0

2025-02-11 15:30:14 UTC

New

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)

VAK

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)