Limit of Jira Align REST API query URL

[Paresh Mathur]

I have a system where I am querying all the features under a large number of capabilities (200+). I am constructing my filter like "parentId eq key1 or parentId eq key2 ..." and so on. I have observed if the total query (including endpoint url) exceeds 4096 characters I get a 404. It doesnt seem to be documented, but can there be such a limit or could I be doing something wrong. 

As a sub question, is my way of querying correct, in JQL we can pass an array and check if a key is in that array but I dont see documentation for something similar in Jira Align API thus the large chaining of ORs. 

[Allan Maxwell]

By definition, the size of an HTTP request is unlimited.  In practice, various implementations do enforce some limit.  The 4096 just so happens to equal 2 to the power of 12 which seems to be too coincidental to not be a Jira Align API server enforced limitation. 

[Paresh Mathur]

I understand the mathematics of this, but can I get any confirmation on this?

[Allan Maxwell]

Atlassian does not specify a size limit or token count limit.

The answer to the second part of your question is also "no".