Http Error Code Unauthorized Access
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Status codes 301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable For Legal Reasons v t e A web server may or may not return a http 402 403 Forbidden HTTP 403 in response to a request from a client for
Http 403
a web page or resource to indicate that the server can be reached and understood the request, but refuses to
Http 404
take any further action. Status code 403 responses are the result of the web server being configured to deny access, for some reason, to the requested resource by the client. A typical request
401 Vs 403
that may receive a 403 Forbidden response is a GET for a web page, performed by a web browser to retrieve the page for display to a user in a browser window. The web server may return a 403 Forbidden status for other types of requests as well. The Apache web server returns 403 Forbidden in response to requests for url paths that correspond to filesystem http code 302 directories, when directory listings have been disabled in the server and there is no Directory Index directive to specify an existing file to be returned to the browser. Some administrators configure the Mod proxy extension to Apache to block such requests, and this will also return 403 Forbidden. Microsoft IIS responds in the same way when directory listings are denied in that server. In WebDAV, the 403 Forbidden response will be returned by the server if the client issued a PROPFIND request but did not also issue the required Depth header, or issued a Depth header of infinity.[1] Contents 1 Difference from status "401 Unauthorized" 2 403 substatus error codes for IIS 3 See also 4 References 5 External links Difference from status "401 Unauthorized"[edit] Status codes 401 (Unauthorized) and 403 (Forbidden) have distinct meanings. A 401 response indicates that access to the resource is restricted, and the request did not provide any HTTP authentication. It is possible that a new request for the same resource will succeed if authentication is provided. The response must include an HTTP WWW-Authenticate header to prompt the user-agent to provide credentials. If valid credentials are not provided via HTTP Author
response. 10.1 Informational 1xx This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line. There are no required headers http 400 for this class of status code. Since HTTP/1.0 did not define any 1xx http status codes cheat sheet status codes, servers MUST NOT send a 1xx response to an HTTP/1.0 client except under experimental conditions. A client MUST http 422 be prepared to accept one or more 1xx status responses prior to a regular response, even if the client does not expect a 100 (Continue) status message. Unexpected 1xx status responses MAY be ignored https://en.wikipedia.org/wiki/HTTP_403 by a user agent. Proxies MUST forward 1xx responses, unless the connection between the proxy and its client has been closed, or unless the proxy itself requested the generation of the 1xx response. (For example, if a proxy adds a "Expect: 100-continue" field when it forwards a request, then it need not forward the corresponding 100 (Continue) response(s).) 10.1.1 100 Continue The client SHOULD continue with its request. https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html This interim response is used to inform the client that the initial part of the request has been received and has not yet been rejected by the server. The client SHOULD continue by sending the remainder of the request or, if the request has already been completed, ignore this response. The server MUST send a final response after the request has been completed. See section 8.2.3 for detailed discussion of the use and handling of this status code. 10.1.2 101 Switching Protocols The server understands and is willing to comply with the client's request, via the Upgrade message header field (section 14.42), for a change in the application protocol being used on this connection. The server will switch protocols to those defined by the response's Upgrade header field immediately after the empty line which terminates the 101 response. The protocol SHOULD be switched only when it is advantageous to do so. For example, switching to a newer version of HTTP is advantageous over older versions, and switching to a real-time, synchronous protocol might be advantageous when delivering resources that use such features. 10.2 Successful 2xx This class of status code indicates that the client's request was successfully received, understood, and accepte
a resource from an HTTP server and it's not allowed to access that resource, the client needs to know enough about http://robertlathanh.com/2012/06/http-status-codes-401-unauthorized-and-403-forbidden-for-authentication-and-authorization-and-oauth/ why in order to present the right message or options to the user. Basically, we need to know whether the user can do something about it or not. https://www.bennadel.com/blog/2400-handling-forbidden-restful-requests-401-vs-403-vs-404.htm HTTP status codes help us differentiate these scenarios and when the reason has to with authentication (verifying who the client is) or authorization (what that client is allowed to http error access), the server should use the 401 and 403, respectively. There are a couple things that complicate the use of 401 and 403: The terminology used around the 401 status code in the HTTP spec (RFC 2616), namely "unauthorized" is often misused in place of "unauthenticated," and HTTP doesn't provide a status code for authenticated users who aren't http error code allowed to use a resource, so we use 403. The Scenarios Let's start by understanding the scenarios that we need to be able to differentiate. There are six outcomes of a request when viewed from an authentication or authorization perspective: # Authentication Authorized Resource delivered HTTP Status Code Resolution provided good
1 no n/a yes yes 2xx n/a 2 no n/a no no 401 Provide Authentication 3 no n/a no no 403 none 4 yes no n/a no 401 Provide Valid Authentication 5 yes yes no no 403 none 6 yes yes yes yes 2xx n/a The unauthenticated client is authorized to access the resource (HTTP 200-class). The unauthenticated client is perhaps authorized to access the resource if authenticated (HTTP 401). The unauthenticated client is not allowed access the resource; authentication will not help (HTTP 403). The client's authentication credentials are incorrect, invalid, expired, or revoked (HTTP 401). The client is authenticated but cannot access the resource (use HTTP 403 Forbidden). The client is authenticateHandling Forbidden RESTful Requests: 401 vs. 403 vs. 404 By Ben Nadel on July 19, 2012 Tags: ColdFusion I don't have a tremendous amount of experience building RESTful APIs; so, it's not always clear which HTTP status code in the 4xx block I should use when refusing to fulfill an incoming resource request. One tricky scenario that I've had to code against recently is the request for a properly formed, valid resource of which the authenticating user doesn't have permissions to view. Image that we have two users in our system: Sarah, with ID 4, and Tricia, with ID 37. Now, imagine that Sarah makes an authenticated request to view Tricia's profile resource:GET /users/37/profile HTTP/1.1Authorization: Basic YmVuK2F206dGVzdA==Accept: application/jsonHere, Sarah is using Basic Authorization to identify herself as Sarah; however, she's making a request to another user's profile (Tricia's). For sake of argument, let's say that in this API, a user can only view his or her own profile. What HTTP status code should I return?The three status codes that felt the most appropriate are:401 - Unauthorized403 - Forbidden404 - Not FoundIn my mind, the use of each of these three HTTP status codes could be justified. Sarah is not authorized to view Tricia's profile (401); Sarah is forbidden from viewing someone else's profile (403); and, Sarah simply cannot see resources that she's not allowed to view (404). The initial problem that I had with using either of the HTTP status codes, 401 or 403, was that I felt like it was exposing secure information. Both of those responses sort of say, "Yeah, that resource exists, but you can't see it." My problem with this is that it confirms that those resources exist. When you ask a Doctor if he treats a particular patient (at least in Law & Order - wicked awesome show!), he will often say something to the effect of, "Officer, you know I can neither confirm nor deny having a patient as it would be a breach of doctor-patient confidentiality." This is how I feel about 401 and 403 in this particular type of resource request - I don't want to confirm or deny its existence. Then, one day, when I was reading over the description of the 403 Forbidden HTTP status code, something clicked. At the end of the description, it states:The server understood the request, but is refusing to fulfill it. Authorization will not help and the request SHOULD NOT be repeated. If the request method was not HEAD and the server wishes to make public why the request has not been fulfilled, it SHOULD describe the rea