http - Tool to view response headers - Stack Overflow
1- See the Http Headers information in Firefox Next click on "Inspector". Date: Sun, 12 Nov GMT Server: Apache Location: /home/afrocolombianidad.info HTTP cache headers control the freshness and validity of your assets It's also important to ensure you format the date properly or it might be. Get HTTP Headers checker, This tool will allow you to view http request and response header. Submit url and check HTTP status codes and HTML source.
As you will see in further articles, the availability of other headers can take precedence over the Expires header forcing the browser to execute a conditional GET.
This is described in more detail in part 11 and part Cache-Control can have the following values: It defines the freshness window in seconds. If less than max-age seconds have passed since the component was requested, the browser will use the cached version, thus avoiding an additional HTTP request. You could specify both response headers, Expires and Cache-Control max-age.
If both are present, the HTTP specification dictates that the max-age directive will override the Expires header. You can find more details in more detail in part Read more about this in part 11 and part The date in this header will be the Last-Modified date that was received with the previous request.Retrofit Tutorial Part 5 - HOW TO LOG HTTP REQUEST & RESPONSE - Android Studio Tutorial
If the resource was modified since this date, the server will respond with a OK status code and send the resource in the body; if the resource was not modified since this date, the server will respond with a Not Modified status code to indicate that the browser can use the resource from its cache. More on this in part SharePoint has a specific way to calculate ETags.
You can read more about this in part The value in this header will be the ETag that was received with the previous request. If the resource was modified since last request, the server will respond with a OK status code and send the resource in the body; if the resource was not modified since this date, the server will respond with a Not Modified status code to indicate that the browser can use the resource from its cache.
Measure Resource Loading Times | Tools for Web Developers | Google Developers
Connection This header indicates whether if the connection can stay open for a next request. Pipelining has better performance than persistent connections. Until pipelining is more widely adopted, Keep-Alive is the way browsers and servers can more efficiently use socket connections for HTTP.
This is even more important for HTTPS because establishing new secure socket connections is more time consuming.
- HTTP headers
- Measure Resource Loading Times
SharePoint headers Additionally, each technology adds its own headers. Most of these headers are pure informational and have no additional value as to ease hackers work.
Key Possible values s Server This response header indicates the type of server that is used to host the web application. In fact, it is the ETag prefixed with RT:.
Messages are color-coded according to their type: Outgoing text messages are color-coded light-green. Incoming text messages are white. WebSocket opcodes are light-yellow.
Notes about current implementation: To refresh the Frames table after new messages arrive, click the resource name on the left. Only the last WebSocket messages are preserved by the Frames table.
View resource initiators and dependencies Warning: This page is deprecated. See View initiators and dependencies for up-to-date information.
How to view HTTP Headers in Firefox?
Hold Shift and hover over a resource to view its initiators and dependencies. This section refers to the resource that you are hovering over as the target. The first resource above the target that is color-coded green is the initiator of the target. If there is a second resource above that which is color-coded green, that's the initiator of the initiator.
Any resources below the target that are color-coded red are dependencies of the target.
Keep in mind that for pages with lots of resources it's possible that you may not be able to see all of the initiators or dependencies. See Sort by activity phase for up-to-date information. By default, the resources in the Requests Table are sorted by the start time of each request, starting with the earliest requests at the top.