UI produces unsafe URLs when collection filters are used

[zhiltsov-max]

Current Behaviour

When I use a filter in UI for, e.g., a list of user tasks, I obtain an unsafe URL like this:

http://localhost:8080/tasks?filter={%22and%22:[{%22==%22:[{%22var%22:%22id%22},15]}]}&page=1

or like this:

It's hard to say which one exactly because the browser displays
partially-encoded URLs in the developer tools and after copy.

There are characters in both cases that are either "potentially unsafe" or reserved:
Actual RFC: https://www.rfc-editor.org/rfc/rfc3986#section-2.2
Previous (pt. 2.2/Unsafe): https://www.ietf.org/rfc/rfc1738.txt

Possible Solution

Use urlencode() or its equivalent. An expression like this:
filter=%7B"%3D%3D"%3A%5B%7B"var"%3A"task_id"%7D%2C14%5D%7D
should be obtained.

Context

Your Environment

• Git hash commit (git log -1): c29b283
• Docker version docker version (e.g. Docker 17.0.05):
• Are you using Docker Swarm or Kubernetes?
• Operating System and version (e.g. Linux, Windows, MacOS):
• Code example or link to GitHub repo or gist to reproduce problem:
• Other diagnostic information / logs:
  Logs from `cvat` container