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  2. List of HTTP header fields - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_header_fields

    Correlates HTTP requests between a client and server. X-Request-ID: f058ebd6-02f7-4d3f-942e-904344e8cde5: X-UA-Compatible [74] Recommends the preferred rendering engine (often a backward-compatibility mode) to use to display the content. Also used to activate Chrome Frame in Internet Explorer. In HTML Standard, only the IE=edge value is defined ...

  3. XMLHttpRequest - Wikipedia

    en.wikipedia.org/wiki/XMLHttpRequest

    Various alternatives exist to circumvent this security feature, including using JSONP, Cross-Origin Resource Sharing (CORS) or alternatives with plugins such as Flash or Silverlight (both now deprecated). Cross-origin XMLHttpRequest is specified in W3C's XMLHttpRequest Level 2 specification. [17] Internet Explorer did not implement CORS until ...

  4. HTTP referer - Wikipedia

    en.wikipedia.org/wiki/HTTP_referer

    By checking the referrer, the server providing the new web page can see where the request originated. In the most common situation, this means that when a user clicks a hyperlink in a web browser , causing the browser to send a request to the server holding the destination web page, the request may include the Referer field, which indicates the ...

  5. Same-origin policy - Wikipedia

    en.wikipedia.org/wiki/Same-origin_policy

    The same-origin policy does not prevent the browser from making GET, POST, OPTIONS, and TRACE requests; it only prevents the responses from being read by user code. Therefore, if an endpoint uses a one of these "safe" request methods to write information or perform an action on a user's behalf, it can be exploited by attackers.

  6. PHP - Wikipedia

    en.wikipedia.org/wiki/PHP

    As of 21 January 2025 (two months after PHP 8.4's release), PHP is used as the server-side programming language on 75.0% of websites where the language could be determined; PHP 7 is the most used version of the language with 47.1% of websites using PHP being on that version, while 40.6% use PHP 8, 12.2% use PHP 5 and 0.1% use PHP 4.

  7. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource. In a POST request, the response will contain an entity describing or containing the result of the action. 201 Created The request has been fulfilled, resulting in the creation of a new ...

  8. Cross-origin resource sharing - Wikipedia

    en.wikipedia.org/wiki/Cross-origin_resource_sharing

    A web page may freely embed cross-origin images, stylesheets, scripts, iframes, and videos. Certain "cross-domain" requests, notably Ajax requests, are forbidden by default by the same-origin security policy. CORS defines a way in which a browser and server can interact to determine whether it is safe to allow the cross-origin request. [1]

  9. Ajax (programming) - Wikipedia

    en.wikipedia.org/wiki/Ajax_(programming)

    fetch() won't send cross-origin cookies unless you set the credentials init option. (Since April 2018. (Since April 2018. The spec changed the default credentials policy to same-origin .