TILs - Fueling Curiosity, One Insight at a Time

Etag HTTP Header
- Etag (also known as entity tag) is a unique identifier for a resource
- This is used to cache the resources that are unchanged
- When a request is recieved by server, it generates response and attaches Etag
- In the subsequent request, application requests for the same resource with If-None-Match header with the value of Etag received in previous step
- Server compares the value of If-None-match header with Etag identifier value on server
- If the values match server responds with 304(Not modified) status code with the empty body
- Application can use the cached response

Get all TODO comments in rails application using rails notes

1. Learned how to use the slack api.
2. Learned how to send message on user command through the slack bot.
3. Learned how to setup and use incoming web hook for slack bot.
4. Learned How to post message in channel using the incoming web hook.
5. Learned how to do post req using the axios.

1. Learned how to make slack bot.
2. Learned how to use slack bot.
3. Learned how to add slack bot to the workspace and channel .
4. Learned how to use brew
5. Learned how to use ngrok and redirect the local host port to the ngrok url.

Faced problem in installing latest version of yarn on Github Actions self hosted runner, used below as a solution to install yarn manually which fixed the issue.
https://github.com/yarnpkg/yarn/issues/3042#issuecomment-348181028

1. i learned how to do filtering and sorting with the api by passing params.
2. i learned how to write test cases for the components like filtering and sorting.
3. i learned how to mock api using the jest.

1.Tomorrow, I learnt how to utilise a single component to prevent code repetition and use that component in every component to prevent code repetition,
2. To make the API scalable, we need to create various methods to call it if I had many end points.

You can use cloudflared to expose apps running on localhost using a dedicated domain, and HTTPS
• For hosting using a random URL just run cloudflared tunnel --url http://localhost:
• For an owned domain, there are a bunch more steps.
◦ Prerequisites:
▪︎ You need a domain name that you own. Can buy one for an year for <200 Rs
▪︎ Create a Cloudflare account. You will be asked to login to dash.cloudflare.com
▪︎ Follow the instructions including the installation instructions in https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/install-and-setup/tunnel-guide/local

TypeScript Pick utility allows us to create a new type by picking a subset of properties from an existing type. Instead of duplicating field declarations we can use Pick utility to extract new types.