title: Simulate fake 404,500 Status Code to check frontend app behaviour
body: <p>I want to simulate a fake 404 status code from the backend to see how my website will behave.</p>
  <p>I don't want to mock fake response status in the code I would like to use some tools.</p>
  <p>Cause sometimes I want to test it on the production which has version x and I don't want to waste time downloading this code and checking if there it is working.</p>
  <p>Just simply mock response header status code for some test value like 404 for the fast check.</p>
  <p>I tried to use software like <a href="https://chrome.google.com/webstore/detail/requestly-modify-headers/mdnleldcmiljblolnjhpnblkcekpdkpa/" rel="nofollow noreferrer">Requestly - chrome extension</a>.</p>
  <p>And configured it like :
  <a href="https://i.stack.imgur.com/q4Spc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/q4Spc.png" alt="enter image description here" /></a></p>
  <p>Modify response for header status put value 404 for google.com site.</p>
  <p>But when I open google.com site I got status 200:
  <a href="https://i.stack.imgur.com/gqQNB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gqQNB.png" alt="enter image description here" /></a></p>
  <p>Do you know how can I change the status code of the given request?
  Maybe by using different soft?</p>