How to use REST correctly when you need to transfer a lot of data in GET?

Question

RESTful API

There is a template service, you can pass a number of parameters to it, with which it will replace the corresponding placeholders in the template. On the one hand, getting the generated page is a GET request. But what if I have so many parameters that it won't fit in the URL? Use POST? In theory, this is incorrect. And in general, a request with a bunch of parameters in the URL looks unimportant.
I'd like to hear your thoughts on this.

Answer 1

Recently, there was an interesting discussion about REST on Habré , and in the comments I liked one option.
In your case, it will look something like this:
Request:
POST /TemplateVariant
{
[many parameters]
}
Response:
201 Created
Location: /TemplateVariant/58f523a2-79c1-475e-98ac-2e6dfa43abcc
Request #2:
GET /TemplateVariant/58f523a2-79c1-475e -98ac-2e6dfa43abcc
Answer #2:
200 OK
{
[done pattern]
}