(Hypertext Transfer Protocol) is the foundation for communication on the World Wide Web. It allows clients, such as web browsers, to interact with servers by sending and receiving data through requests and responses. When a client requests a webpage, it sends an HTTP request containing the (Uniform Resource Locator) to the server. The server then processes the request, retrieves the corresponding (Hypertext Markup Language) file, and sends back an .
Within an HTML file, various s are used to structure and display the content. These tags can include s, which are created using the 'a' tag and the URL as the . When a user clicks on a hyperlink, it triggers an HTTP GET request to the specified URL, allowing them to navigate to a different webpage.
When submitting a form on a webpage, the method used is usually HTTP . With a POST request, data is sent to the server which can then process and store it accordingly. The server responds with an HTTP response, which includes a indicating the success or failure of the request. The status code can provide information about any issues that occurred during the request, such as a '404 Not Found' error if the requested resource does not exist.
HTTP responses also contain s, which are key-value pairs that provide additional information about the response. These headers can include details such as the content type, cache control directives, and cookie settings. Speaking of cookies, they are small pieces of data stored on the client's browser by the server. There are different types of cookies, including s, s, and s. Session cookies are temporary and only exist until the browser is closed, while persistent cookies remain on the client's device for a longer duration. Tracking cookies are used to gather information about the user's browsing habits.
In HTML, CSS (Cascading Style Sheets) is used to define the visual appearance and layout of a webpage. CSS can be embedded, inline, or external. Embedded CSS is defined within the 'style' attribute of an HTML tag, while inline CSS is applied directly to the tag. is stored in a separate file and linked to the HTML file.
The in CSS refers to the process of resolving conflicting styles for an element based on their specificity and order of appearance. The is used to target specific elements, and the value is the property assigned to that selector. The external CSS file takes precedence over inline and embedded styles. This hierarchy ensures that the styles are applied consistently throughout the webpage.
Keywords
url | http | tracking cookie | selector | persistent cookie | get | html | tag | header | status code | post | http response | cascade | stylesheet | external css | hyperlink | session cookie | value |
