AWS Cloudfront document says:
If you set the TTL for a particular origin to 0, CloudFront will still cache the content from that origin. It will then make a GET request with an If-Modified-Since header, thereby giving the origin a chance to signal that CloudFront can continue to use the cached content if it hasn't changed at the origin
I need to configure my Dynamic Content. I have already set TTL to 0.. I want every request to go to Origin always. Is there a way I avoid this additional GET request with an If-Modified-Since header ! Why this extra request everytime !
Is there a way I avoid this additional
GETrequest
It sounds as if you are misinterpreting the what you are reading. Unfortunately, you didn't cite the source, so it's difficult to go back and pick up more context; however, this is not referring to an "extra" request.
It will then make a
GETrequest with an If-Modified-Since header
This refers to each time the object is subsequently requested by a browser. CloudFront sends the next request with If-Modified-Since: so that your origin server has the option of returning a 304 Not Modified response... it doesn't send two requests to the origin in response to one request from a browser.
If your content is always dynamic, return Cache-Control: private, no-cache, no-store and set Minimum TTL to 0.