How do I get the last modified HTTP?

To check the Last-Modified in action go to Inspect Element -> Network check the request header for Last-Modified like below, Last-Modified is highlighted.

What is last modified in HTTP response?

The Last-Modified response HTTP header contains a date and time when the origin server believes the resource was last modified. It is used as a validator to determine if the resource is the same as the previously stored one. Less accurate than an ETag header, it is a fallback mechanism.

What is if modified since?

The If-Modified-Since HTTP header indicates the time for which a browser first downloaded a resource from the server. This helps determine whether or not the resource has changed since the last time it was accessed.

How is the last modified HTTP header used to support Web caching?

The Last-Modified response header specifies the last time a change was made in the returned content, in the form of a time stamp. ETag values are unique identifiers generated by the server and changed every time the object is modified. Either can be used to determine if cached content is up to date.

What are the If-modified-since and if-none-match header used for?

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-none-match?

The meaning of “If-None-Match: *” is that the method MUST NOT be performed if the representation selected by the origin server (or by a cache, possibly using the Vary mechanism, see section 14.44) exists, and SHOULD be performed if the representation does not exist.

How do I find out when a website was last modified?

Start by opening the webpage in your browser. In the address bar, type the following, “javascript:alert(document. lastModified)” after the web page’s URL. When you press enter, you will see a popup that displays the latest updated date.

How do I request a cached post?

The POST response body can only be cached for subsequent GET requests to the same resource. Set the Location or Content-Location header in the POST response to communicate which resource the body represents. So the only technically valid way to cache a POST request, is for subsequent GETs to the same resource.

Does browser cache HTML files?

The browser will retrieve the HTML page from the web server but consult its cache for the static assets (JavaScript, CSS, images). We can see the difference cache makes when we refresh the Wikipedia page: The data transferred went down to 928 bytes — that’s 0.3% the size of the initial page load.