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Today Dmytro Learned

TIL is short for "Today I Learned" and it's where I collect small, practical nuggets of information that I've recently discovered or explained to someone. I believe these little gems of knowledge are too useful to be lost in the vastness of social media platforms like Twitter or GitHub comments, so I keep them safe here. Think of TIL as my digital garden, where I can nurture these nuggets of knowledge and watch them grow. 🌱

2025

🔐 PDF passwords

Sep

TIL that we can add password on PDF after reading article "How to remove password" 😅

2025

🔢 Never use floating-point numbers for moneyProgramming

Sep

Long story short: Use Decimal, not Float numbers for money-related stuff. I had a lack to learn it from from social media when it was called Twitter 😅 and not from my own experience. A few days ago I decided on a whim to change the cost of a Pegasus license

2025

📲 SMS URLs

Aug

Did you know there are is a URL scheme for sending an “SMS” or text message, similar to mailto:? (c) https://sethmlarson.dev/sms-urls

2025

💻 Install pre-commit using uv tools

Jun

Run next command: uv tool install pre-commit --with pre-commit-uv Source from Adam's blog - https://adamj.eu/tech/2025/05/07/pre-commit-install-uv/

2025

💣 Session fixation attacks

Jun

I never thought about that Django clears the previous session and creates a new one for logged in user. Maybe I did not have such tasks in my experience so I can work with that in details, but when I just read an article Deleting anonymous users' baskets when

2024

💻 PyCharm - debugging in docker compose

May

As for using debugging in PyCharm for a compose project, you need to set env variable COMPOSE_PROJECT_NAME = {projectName}a

2024

🌐 Forward proxy vs Reverse proxy

May

The forward proxy and reverse proxy are two very confusing names. You just need to know that, from your perspective, forward proxy is outbound proxy , and reverse proxy is inbound proxy. For example, if YOU are making request to the internet through a proxy, that proxy is forward proxy. And

2024

⚽ Vanilla JavaScript - Wildcard (*) Selector

Mar

In vanilla JavaScript, we can use wildcard (*) to match multiple elements (nodes) in the HTML DOM object. We can also match elements with attribute starting with, ending with or contains certain values. For example, the following selectors will [name^="password"] will match all elements with name starting with

2024

6️⃣4️⃣ Base64 Encoding & Performance in Web

Feb

Base64 encoding increases filesize in ways that we can’t effectively mitigate (e.g. Gzip). This increase in filesize delays rendering, because it’s happening to a render-blocking resource. Base64 encoding also forces non-critical assets onto the critical path. (e.g images, fonts) This means that—in this particular case—

2024

🗑YAGNI: Soft Delete

Jan

You might think you need soft delete and that is a cool feature. Yes, it is cool feature but there tricky and hard parts of it like: * Code leakage - you need to remember filter on reverse relationships * Losing foreign keys - ForeignKey won't be properly cascade deleted

2024

🐳 Optimizing Python application's Docker image with strip

Jan

Docker image can be optimised by removing shared library size: find /usr/local/lib/python3.11/dist-packages/ -name "*.so" | xargs strip

2023

🎸 ModelChoiceField to_field_name doesn't work if it's different from the model field's to_fieldDjango

Oct

Source from Django ticket To avoid that issue I have to provide initial for forms of that object.

2023

🔍 JetBrains ScopeGitHub

Oct

About JetBrains Scope from article which I can use If I want to search Python application code in Django projects, excluding unit tests, database migrations and Django admin site code. Here is the custom scope: file:.py&&!file:/tests//&&!file:/migrations//&&!file:/admin.py

2023

🪀 GitHub Code SearchGitHub

Oct

* You can add NOT is:fork to exclude forks (source). TBD

2023

🌐 HTTP Strict Transport Security (HSTS)Programming

Sep

In ongoing project our SEO-team asked about investigating redirect from http links to https with status code 307. They asked to investigate it. So what I did is check via Chrome to confirm that status is 307 - confirmed✅ Then checked via curl: HTTP/1.1 308 Permanent Redirect Date: