httptoolkit VS Requestly

HTTP Toolkit, you will need to install one in your PC and another one in the emulator.

Maybe not exactly what you're looking for, but if you could side-load on windows this app should work. https://httptoolkit.com/

use https://httptoolkit.com/ but it's getting a bit off-topic :)

I run HTTP Toolkit (https://httptoolkit.com) which passed $2k a couple of years back. No longer a side project, as it's made enough money for me to work on it full time for a fair while now, but it certainly started that way, and it's still a one-man show (plus many wonderful open-source contributors).

I suspect that'll be a common theme in answers here though: if you have a side project making $2k a month, in most of the world that's enough for you to go full-time and try to take it further. If you can make $2k/month on something working only part-time, you can definitely make a lot more if you focus on it.

On your questions: HTTP Toolkit is a desktop app (plus a mobile app and other components for integrations) but it's an Electron app that effectively functions as a SaaS (with a freemium subscription model) that just happens to have a component that runs on your computer. And actually getting to $2k wasn't overnight at all - it took a couple of years of slow steady slog. A few inflection points that made a notable difference (releasing rewriting support & Android support particularly) but mostly it was a matter of "just keep pushing", trusting the trajectory would keep going, and steadily grinding upwards. It's great where it is now, but it's hard work - a solo business is not for the faint of heart!

you can use tools like https://httptoolkit.com/ to check the requests

Requestly- Makes frontend development cycle 10x faster with API Client, Mock Server, Intercept & Modify HTTP Requests and Session Replays.

[1]: https://github.com/requestly/requestly/

If you want to intercept and modify a incoming json response for some specific url pattern, would a service worker be a good way to do so?

To illustrate, assume I frequently browse example.com and want to trick my browser into thinking that I have "favorited" every post. It's trivial to write a for loop that iterates over response.json and sets `is_favorite = true`. But it's not as clear to me where this script should ideally live in order to have the logic always executed before the response is made available to the site.

Your comment made me think about whether I can replace my overkill solution (https://requestly.io/) with something lightweight.

If you prefer open-source there is Requestly and Toolkit.

If you don't know Requestly, It is an open-source Chrome/Firefox/Edge extension to intercept & modify HTTP requests & responses. One of the popular features is to modify HTTP headers. We also offer workspaces for easy collaboration between team members.

Hey, open-source community, This is Sachin, One of the core maintainers of Requestly - An open-source alternative to Charles Proxy & Telerik Fiddler. In case you don’t know about Charles Proxy & Fiddler, both of them are two decades-old products used widely to Inspect & Modify HTTP traffic in web & mobile apps.

In /etc/hosts file you put only IP addresses and hostnames, i.e. 127.0.0.1 cdn.cloudflare.steamstatic.com. Then you have to set up a web server on localhost port 80 and put your image at http://localhost/steamcommunity/public/images/apps/753/1d0167575d746dadea7706685c0f3c01c8aeb6d8.jpg as well as other files from https://cdn.cloudflare.steamstatic.com. You also have to keep the URLs updated when they change upstream. It's not worth it. Better use a local proxy server like mitmproxy or requestly.

Requestly founder here. You are essentially looking for Requestly - A Chrome/Firefox browser extension to Intercept & Modify HTTP requests. Using Requestly you can actually do the following things

For development/Debugging: 1. VSCode - Got used to the key bindings and integrated terminal, so now it's really hard to switch 2. Requestly - For easily setting up local debugging environments. I am less of a UI guy, so this allows me to use the live UI of a deployed site, and redirect whichever request I want to play with to my local server. 3. Wireshark - To better understand a network protocol.

[0]: https://requestly.io