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Why does the same-origin policy exist?
Because Same-origin Policy is supported by effectively all modern browsers, web resources can reach one another’s contents, attributes, and so forth if they use same protocol, same domain and same port; therefore they have same origin. If not, reaching and changing document attributes are prevented by browsers.
Can two IP have same hostname?
The hosts file allows no way of distinguishing different “record types” for its resolution. So for hostname to IP address mapping, you only get one IP address per hostname (but multiple hostnames could resolve to the same IP address, which is the opposite).
Is host and IP address the same?
Host–A computer or other device on a TCP/IP network. IP–The network protocol used for sending network packets over a TCP/IP network or the Internet. IP Address–A unique 32-bit address for a host on a TCP/IP network or internetwork.
Can you have 2 A records DNS?
You can do a lot with A records, including using multiple A records for the same domain in order to provide redundancy and fallbacks. Additionally, multiple names could point to the same address, in which case each would have its own A record pointing to that same IP address. The DNS A record is specified by RFC 1035.
Is IP address the host name?
A host, or website, on the Internet is identified by a host name, such as www.example.com . Host names are sometimes called domain names. Host names are mapped to IP addresses, but a host name and an IP address do not have a one-to-one relationship. A host name is used when a web client makes an HTTP request to a host.
Which is the best definition of same origin policy?
Same-origin policy. In computing, the same-origin policy (sometimes abbreviated as SOP) is an important concept in the web application security model. Under the policy, a web browser permits scripts contained in a first web page to access data in a second web page, but only if both web pages have the same origin.
Is there a same origin policy for WebSockets?
WebSockets. Modern browsers will permit a script to connect to a WebSocket address without applying the same-origin policy. However, they recognize when a WebSocket URI is used, and insert an Origin: header into the request that indicates the origin of the script requesting the connection. To ensure cross-site security,…
Is there a way to relax same origin policy?
The other technique for relaxing the same-origin policy is standardized under the name Cross-Origin Resource Sharing (CORS). This standard extends HTTP with a new Origin request header and a new Access-Control-Allow-Origin response header.
What does it mean when a document does not have the same origin?
Cross-origin script API access JavaScript APIs like iframe.contentWindow, window.parent, window.open, and window.opener allow documents to directly reference each other. When two documents do not have the same origin, these references provide very limited access to Window and Location objects, as described in the next two sections.