What HTTP status code means that the requested file was found but has not changed since date provided in the IF-modified-since header?

What HTTP status code means that the requested file was found but has not changed since date provided in the IF-modified-since header?

HTTP 304 Status Code
What is The HTTP 304 Status Code? HTTP 304, also sometimes known as “304 Not Modified”, is a code that communicates to your browser that: “The requested resource has not been modified since the last time you accessed it.”

What are the If-modified-since and if-none-match headers used for why might you be interested in these when attacking an application?

Why moght you be interested in these when attacking an application? The If-Modified-Since header is used to specify the time at which the browser last received the requested resource. The If-None-Match header is used to specify the entity tag that the server issued with the requested resource when it was last received.

What is if modified since?

The If-Modified-Since request HTTP header makes the request conditional: the server will send back the requested resource, with a 200 status, only if it has been last modified after the given date. When used in combination with If-None-Match , it is ignored, unless the server doesn’t support If-None-Match .

Why does my browser not send if modified since header?

Self-signed certificate or certificate for a different domain would cause script files to not cache at all. Browser send no if-modified-since or if-none-match headers on the request. Switching to HTTP or going through the Certificate’s DNS to the same servers would make the browser include these headers.

When to use if modified since in caching?

According to this article, these are the situations browsers will request using If-Modified-Since: So if you are reloading the page to test your caching, it won’t work since the browser will re-request the images. Try clicking a link then another link back to the first page.

What causes browser to not cache if modified since?

I found that setting BOTH max-age= & Expires can cause browsers to not send If-Modified-Since header AND not to cache at all if the values don’t match. Something to be aware of if you have caching issues & used the different headers in combination.

Why do I need an if modified since header?

Unfortunately on the second refresh it requests the object again with an If-Modified-Since header. Unfortunately due to silly outdated proxy software we can’t use Keep-Alive, or put any other servers/proxys in front of the application. We also can’t improve the performance of the server and reduce the network latency.