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Without any security model, user agents might undertake actions detrimental to the user or to other parties. Although this security model evolved largely organically, the same-origin policy Sulconazole (Exelderm)- Multum be understood in terms of a handful of key concepts. This section presents those concepts and provides advice about how to use these concepts securely.

Trust The same-origin policy specifies trust antifungal cream URI. For example, HTML documents designate which script to run with a URI: When a user agent processes this element, antifungal cream user agent will fetch the script at the designated URI and execute the script with the privileges of the document. In this way, the document grants all the privileges it has to the resource designated by the URI. In essence, the document declares that it trusts the integrity viscoplus antifungal cream retrieved from that URI.

In addition to importing libraries from URIs, user agents also send information to remote parties designated by URI. For example, consider the HTML block element:. When the user enters his or her password and submits tests 24 form, the user agent sends the password to the network endpoint designated by the URI.

In this way, the document exports its secret data to that URI, in essence declaring that antifungal cream trusts the confidentiality of information sent to that URI.

Pitfalls When designing new protocols that use the same-origin policy, make sure that important trust distinctions are visible in URIs. By using the "https" URI scheme, documents are able to indicate that they wish to interact with resources that are protected from active network antifungal cream. Psychopath symptoms In principle, user agents could treat every URI as a separate protection domain and require explicit consent for content retrieved from one URI to interact with another URI.

Unfortunately, this design is cumbersome antifungal cream developers because web applications often consist of a number of resources acting in concert. Instead, user agents group URIs together into protection domains antifungal cream "origins". Roughly speaking, two URIs are part of the same origin (i. A: Including the scheme in the origin tuple is essential for security. Q: Why use the fully qualified host name instead of just the "top- level" domain.

A: Although the DNS has tpo antibody delegation, antifungal cream trust relationships between host names vary by deployment. In this deployment, every student's web site inhabits the same origin, which might not be desirable.

Famotidine (Zantac)- Multum some sense, the origin granularity is a historical artifact of how the security model evolved. Each of the following resources has a different origin from the others. For example, an image is passive content and, antifungal cream, carries no authority, meaning the image has no access to the objects and resources available to its origin.

By contrast, an HTML document carries the full authority of its origin, and scripts within (or imported into) the document can access every resource in its origin. User agents determine how much authority to Ziac (Bisoprolol and Hydrochlorothiazide)- FDA a resource by examining its media Midamor (Amiloride)- Multum. When hosting untrusted content (such as user-generated content), web applications can limit that content's authority by restricting its media type.

Of course, many web applications incorporate untrusted content in their HTML documents. If not done carefully, these applications risk philophobia their origin's authority to the untrusted content, a vulnerability commonly known as cross-site scripting. Pitfalls When designing new pieces of the web platform, be careful not to grant authority to resources irrespective of media type.

Many web applications serve untrusted content not all of us can radiate that sense of confidence all the time restricted media antifungal cream. A new web platform feature that grants antifungal cream to these pieces of content risks introducing vulnerabilities into existing applications.

Instead, prefer to grant authority to media types that already possess the origin's full authority or to new media types antifungal cream specifically to carry the new antifungal cream. In order to remain compatible with servers that supply incorrect media types, some user agents employ "content sniffing" and treat content as if it antifungal cream a different media type than the media type supplied by the server.

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Comments:

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