HN Rules: "Show HN is for something you've made that other people can play with. HN users can try it out, give you feedback, and ask questions in the thread."
I thought the whole purpose of Show HN is to show what you've created. Should there be restrictions on the types of things being created?
In your example, I think the browser extension would hide every submission on Show HN.
This is the sort of input that you'd selectively pick in a unit test, too. What you don't do is also picking inputs like "llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch" too (all lowercase) :)
We use Charles extensively at work, it's a great tool.
The only thing that really annoys me is that, this being a Java app, the interface works slightly different than the standard OS X interface I'm using to.
I regularly use cmd + backspace, for example, to delete all text until between the beginning of the line and the cursor. In Charles this is a hot key that removes all recorded requests. There are more of such things.
I've been looking for a similar app with a native UI, but haven't been able to find one yet.
Nice, the part about JSON schema decoding seems useful. I've done that by hand and ripped apart enough curl requests from chrome network tools -> right click -> copy as curl to want an easier way. Paw can also import HTTP requests into itself (free plugin) and export Python Requests code or different curl or many other versions for different languages, as well as inspecting the request and response headers and bodies, making things like the Authorization header super easy, etc. We use it at work quite a bit and go as far as documenting the APIs for things with a paw file (you could get the same thing with a Swagger doc and the swagger ui, and sometimes we do that as well). https://luckymarmot.com/paw (I'm not affiliated with them in any way beyond being a paying user grateful for a nice tool).
Processes can communicate. I reckon you could have a process that's responsible for managing the cache instead of managing a separate cache from each process.
Question for OP: how would you feel about a browser extension that automatically recognises submissions of this nature and hides them?