Description
In the text below you can see the first entry which shows the headers of the HEAD response where the last_modified header is
Wed, 15 Jul 2020 20:08:32 GMT.
The second entry is the if-modified-since header for the GET request.
The third entry shows the headers of the GET response where the last_modified header is Wed, 15 Jul 2020 20:07:46 GMT
The url is https://a.4cdn.org/tv/catalog.json.
Why are these two last_modified headers different?
1: {connection: keep-alive, last-modified: Wed, 15 Jul 2020 20:08:32 GMT, cache-control: public, must-revalidate, proxy-revalidate, cf-request-id: 03f5b0e4fe0000faa0c4955200000001, date: Wed, 15 Jul 2020 20:08:33 GMT, access-control-allow-origin: http://boards.4chan.org, vary: Accept-Encoding,Origin, Accept-Encoding, content-encoding: gzip, cf-cache-status: EXPIRED, expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct", access-control-max-age: 1728000, content-type: application/json, server: cloudflare, access-control-allow-headers: If-Modified-Since, accept-ranges: bytes, access-control-allow-methods: GET, OPTIONS, content-length: 76148, cf-ray: 5b361db4cdd3faa0-AMS, etag: "5f0f6240-12974", expires: -1}
2: {if-modified-since: Wed, 15 Jul 2020 20:07:46 GMT}
3: {connection: keep-alive, cache-control: public, must-revalidate, proxy-revalidate, last-modified: Wed, 15 Jul 2020 20:07:46 GMT, cf-request-id: 03f5b0e8d20000fa38d4806200000001, date: Wed, 15 Jul 2020 20:08:33 GMT, access-control-allow-origin: http://boards.4chan.org, vary: Accept-Encoding,Origin, Accept-Encoding, age: 35, cf-cache-status: UPDATING, expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct", access-control-max-age: 1728000, server: cloudflare, access-control-allow-headers: If-Modified-Since, access-control-allow-methods: GET, OPTIONS, cf-ray: 5b361dbae89bfa38-AMS, etag: "5f0f6212-12885", expires: -1}