"request, such as a web browser request for a web page, with a numeric response code and an optional, mandatory, or disallowed (based upon the status code) message. In the code 404, the first digit indicates a client error, such as a mistyped Uniform Resource Locator (URL). The following two digits indicate the specific error encountered. HTTP's use of three-digit codes is similar to the use of such codes in earlier protocols such as FTP and NNTP. At the HTTP level, a 404 response code is followed by a human-readable ""reason phrase"". The HTTP specification suggests the phrase ""Not Found"""
"HTTP 403 Those 403 is a standard HTTP status code communicated to clients by an HTTP server to indicate that the server understood the request, but will not fulfill it. There are a number of sub-status error codes that provide a more specific reason for responding with the 403 status code. HTTP 403 provides a distinct error case from HTTP 401; while HTTP 401 is returned when the client has not authorized , and implies that a successful response may be returned following valid authentication, HTTP 403 is returned when the client is not permitted access to the resource for"
"HTTP 451 In computer networking, HTTP 451 Unavailable For Legal Reasons is an error status code of the HTTP protocol to be displayed when the user requests a resource which cannot be served for legal reasons, such as a web page censored by a government. The number 451 is a reference to Ray Bradbury's 1953 dystopian novel ""Fahrenheit 451"", in which books are outlawed. 451 could be described as a more explanatory variant of 403 Forbidden. This status code is standardized in RFC 7725. Examples of situations where an HTTP 451 error code could be displayed include web pages deemed"
"and most new browsers use HTTPS connections as the reason for the discontinuation. Google flags search results with the message ""This site may harm your computer"" if the site is known to install malicious software in the background or otherwise surreptitiously. Google does this to protect users against visiting sites that could harm their computers. For approximately 40 minutes on January 31, 2009, all search results were mistakenly classified as malware and could therefore not be clicked; instead a warning message was displayed and the user was required to enter the requested URL manually. The bug was caused by human"
"a 404 error will be returned. By just enabling SSL and providing an SSL certificate name, an HTTPS server can be initiated with a self-signed certificate that changes with every restart of the server. require 'webrick' require 'webrick/https' cert_name = [%w[CN localhost],] server = WEBrick::HTTPServer.new(:Port => 1234, However, a pre-determined key and certificate can also be provided for instantiating HTTPS Server as shown below: require 'openssl' cert = OpenSSL::X509::Certificate.new File.read '/var/myapp/cert.pem' pkey = OpenSSL::PKey::RSA.new File.read '/var/myapp/pkey.pem' server = WEBrick::HTTPServer.new(:Port => 1234, WEBrick can also proxy GET, HEAD and POST requests: require 'webrick/httpproxy' proxy = WEBrick::HTTPProxyServer.new :Port => 1234 trap 'INT'"
"an imaginary character named ""Ammar 404"" who represents ""the invisible censor"". There are ""soft 3XX"" where content is returned with a status 200 but it comes from a redirected page, such as when missing pages are redirected to the domain root/home page. The webserver software developed by Microsoft, Microsoft's Internet Information Services (IIS), returns a set of substatus codes with its 404 responses. The substatus codes take the form of decimal numbers appended to the 404 status code. The substatus codes are not officially recognized by IANA and are not returned by non-Microsoft servers. Microsoft's IIS 7.0, IIS 7.5, and"
"is unable to find a file with any of the names listed in its configuration, it may either return an error (generally 404 Not Found) or generate its own index page listing the files in the directory. It may also return a 403 Index Listing Forbidden. Usually this option is also configurable. Since the index page is often the first page of a Web site that a user sees, it is sometimes used to offer a menu of language options for large Web sites that use geo targeting. It is also possible to avoid this step, for example by using"
"IIS supports a proprietary ""TRACK"" method, which behaves similarly, and which is likewise recommended to be disabled. In HTTP/1.0 and since, the first line of the HTTP response is called the ""status line"" and includes a numeric ""status code"" (such as ""404"") and a textual ""reason phrase"" (such as ""Not Found""). The way the user agent handles the response depends primarily on the code, and secondarily on the other response header fields. Custom status codes can be used, for if the user agent encounters a code it does not recognize, it can use the first digit of the code to"
"a danger to national security, or web pages deemed to violate copyright, privacy, blasphemy laws, or any other law or court order. The RFC is specific that a 451 response does not indicate whether the resource exists but requests for it have been blocked, if the resource has been removed for legal reasons and no longer exists, or even if the resource has never existed, but any discussion of its topic has been legally forbidden (see superinjunction). Some sites have previously returned HTTP 404 (Not Found) or similar if they are not legally permitted to disclose that the resource has"
"and suggests some information for why that was so. Support for the HTTP 307 (Temporary Redirect), 404 (Not Found) and 410 (Gone) response codes are provided for completeness. PURLs of types ""404"" and ""410"" are provided to assist administrators in marking PURLs that require repair. PURLs of these types allow for more efficient indications of resource identification failure when target resources have moved and a suitable replacement has not been identified. PURLs of type ""clone"" are used solely during PURL administration as a convenient method of copying an existing PURL record into a new PURL. The PURL service includes a"
"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 The following nonstandard codes are returned by Microsoft's Internet Information Services and are not officially recognized by IANA. HTTP 403 Those 403 is a standard HTTP status code communicated to clients by an HTTP server to indicate that the server understood the request, but will not fulfill it. There are a number of sub-status error codes that provide a more specific"
"blocking (an ISP, DNS provider, caching system, etc.), not the legal authority mandating the block. At an IETF hackathon, participants used a web crawler to discover that several implementations misunderstood this header and gave the legal authority instead. HTTP 451 In computer networking, HTTP 451 Unavailable For Legal Reasons is an error status code of the HTTP protocol to be displayed when the user requests a resource which cannot be served for legal reasons, such as a web page censored by a government. The number 451 is a reference to Ray Bradbury's 1953 dystopian novel ""Fahrenheit 451"", in which books"
"fault would make the operation about 40,000 times slower. Page fault A page fault (sometimes called #PF, PF or hard fault) is a type of exception raised by computer hardware when a running program accesses a memory page that is not currently mapped by the memory management unit (MMU) into the virtual address space of a process. Logically, the page may be accessible to the process, but requires a mapping to be added to the process page tables, and may additionally require the actual page contents to be loaded from a backing store such as a disk. The processor's MMU"
"Page fault A page fault (sometimes called #PF, PF or hard fault) is a type of exception raised by computer hardware when a running program accesses a memory page that is not currently mapped by the memory management unit (MMU) into the virtual address space of a process. Logically, the page may be accessible to the process, but requires a mapping to be added to the process page tables, and may additionally require the actual page contents to be loaded from a backing store such as a disk. The processor's MMU detects the page fault, while the exception handling software"
"list of websites that it deems to contain illegal images"" there have been questions raised regarding the legality of their viewing content that would normally constitute a criminal offence. The IWF has been criticized for blacklisting legal content and for not telling websites that they are being blocked. In these circumstances the owner(s) of the blocked webpage might not even know they have offending content on their site, which means that the content would still be readily available to anyone outside of the UK. The blacklisting of sites may be concealed by a generic HTTP 404 ""page not found"" message"
"a driver running in kernel mode encounters an error from which it cannot recover. This is usually caused by an illegal operation being performed. The only safe action the operating system can take in this situation is to restart the computer. As a result, data may be lost, as users are not given an opportunity to save data that has not yet been saved to the hard drive. The text on the error screen contains the code of the error and its symbolic name (e.g. ""0x0000001E, KMODE_EXCEPTION_NOT_HANDLED"") along with four error-dependent values in parentheses that are there to help software"
"that cannot be represented as an information resource. PURLs of type 303 are used most often to redirect to metadata in a serialization format of the Resource Description Framework (RDF) and have relevance for Semantic Web and linked data content. This use of the 303 HTTP status code is conformant with the http-range-14 finding of the Technical Architecture Group of the World Wide Web Consortium. A PURL of type ""307"" informs a user that the resource temporarily resides at a different URL from the norm. PURLs of types 404 and 410 note that the requested resource could not be found"
"An alternative is using a specific broken link checker like Xenu's Link Sleuth. However, if a URL returns an HTTP 200 (OK) response, it may be accessible, but the contents of the page could have changed and may no longer be relevant. So manual checking links seems to be a must. Some web servers also return a soft 404, reporting to computers that the link works even though it doesn't. Bar-Yossef et al. (2004) developed a heuristic for automatically discovering soft 404s. There are numerous solutions for tackling broken links: Some work to prevent them in the first place, while"
"no longer displayed from fusker sites. Some client-side fusker implementations blindly search domains for images based on common file names and directory structures. Some argue the numerous HTTP 404 ""file not found"" and HTTP 403 ""forbidden"" server errors generated constitute a denial of service attack. This behavior has in some cases given the practice of client-side fusking a bad name. In response, most web site administrators check the referrer and user agent headers sent by the requesting client software to prevent their images from being ""fuskered"", or require users to log in. However, some fusker software has the ability to"
"some reason besides authentication. This other reason needs to be acted upon before re-requesting access to the resource. Error 403: ""The server understood the request, but is refusing to fulfill it. Authorization will not help and the request SHOULD NOT be repeated."" Error 401: ""The request requires user authentication. The response MUST include a WWW-Authenticate header field (section 14.47) containing a challenge applicable to the requested resource. The client MAY repeat the request with a suitable Authorization header field (section 14.8). If the request already included Authorization credentials, then the 401 response indicates that authorization has been refused for those"
"error message if the remote server is using a self-signed certificate, or if the remote server certificate is not signed by a CA listed in the CA cert file. -k or --insecure option can be used to skip certificate verification. Alternatively, if the remote server is trusted, the remote server CA certificate can be added to the CA certificate store file. CURL cURL (pronounced 'curl') is a computer software project providing a library and command-line tool for transferring data using various protocols. The cURL project produces two products, libcurl and cURL. It was first released in 1997. The name stands"
"found page' error rather than deliver the actual page or a warning page. Other ISPs use different systems such as WebMinder. In July and again in October 2011, the UK High Court ruled that British Telecom must block access to a website (newzbin.com) which ""provides links to pirated movies"". In September 2011, in response to the court ruling and with encouragement from government, leading UK ISPs are reported to have privately agreed in principle to quickly restrict access to websites when presented with court orders. In May 2012 the High Court ordered UK ISPs to block The Pirate Bay to"
"and indicate that the page is loaded. Thus major faults are more expensive than minor faults and add storage access latency to the interrupted program's execution. If a page fault occurs for a reference to an address that is not part of the virtual address space, meaning there cannot be a page in memory corresponding to it, then it is called an invalid page fault. The page fault handler in the operating system will then generally pass a segmentation fault to the offending process, indicating that the access was invalid; this usually results in abnormal termination of the code that"
"code into the website's files before uploading the files back onto the server. The code is inserted in any file that contains a <body> tag, such as HTML, PHP, JavaScript, ASP and ASPx files. The inserted PHP code contains base64-encoded JavaScript that will infect computers that execute the code. In addition, some pages may have inline frames inserted into them. Typically, iframe code contains hidden links to malicious websites. The virus will also modify .htaccess and HOSTS files, and create images.php files in directories named 'images'. The infection is not a server-wide exploit. It will only infect sites on the"
"and the website has a 503 HTTP error, for now the clipboard function only works. Images stored on the server are being encrypted, and it is not possible to mass-decrypt images by an administrator. Unless presented with URL, that contains file pointer and decryption key, the file itself cannot be decrypted. VVCap VVCap was a screenshot program that operated under the Windows operating system. It was created and distributed by G Central. VVCap was available in English, Spanish and Russian versions, and is supported in those languages. ""VVCap"" replaces the native ""Print Screen"" function with additional features, such as: screenshot"
"HTTPRange-14 httpRange-14 is a long-running logical conundrum or design problem in the semantic web. The problem arises because when HTTP is extended from referring only to documents to talking about real-world things (planets, flowers, emotions, Platonic forms, etc) the domain of HTTP GET becomes undefined. The HTTP protocol was originally designed to transfer information objects, specifically Hypertext such as HTML. The GET request was issued by a client to retrieve data at a particular URL. Retrieving non-HTML information objects (images, flash files, CSS files, streaming video, etc) was not a problem, since all of these could be streamed across the"
"credentials."" RFC2616 See ""403 substatus error codes for IIS"" for possible reasons of why the webserver is refusing to fulfill the request. The Apache web server returns 403 Forbidden in response to requests for URL paths that correspond to file system 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"
"HTTP 302 The HTTP response status code 302 Found is a common way of performing URL redirection. The HTTP/1.0 specification (RFC 1945) initially defined this code, and gave it the description phrase ""Moved Temporarily"" rather than ""Found"". An HTTP response with this status code will additionally provide a URL in the header field Location. This is an invitation to the user agent (e.g. a web browser) to make a second, otherwise identical, request to the new URL specified in the location field. The end result is a redirection to the new URL. Many web browsers implemented this code in a"
"large scale disaster"". The software runs only on Microsoft Windows x86, so Microsoft Windows x86-64, Mac OS X, Linux and users of other operating systems are ignored. Even on Microsoft Windows, the software is known to interfere with Internet Explorer and Google Chrome, and is incompatible with Mozilla Firefox. Also on 11 June 2009, a Netease article reported that the master password of the software can be easily cracked. The software stores the MD5 checksum of the password in a text file disguised as a DLL (codice_1), thus the password can be arbitrarily set by changing the contents of the"
"in HTTP and HTTP with Secure Sockets Layer (SSL) or HTTPS URLs in Microsoft Internet Explorer. The following URL syntax is no longer supported in Internet Explorer if this security patch has been applied: SAP Logon Ticket SAP Logon Tickets represent user credentials in SAP systems. When enabled, users can access multiple SAP applications and services through SAPgui and web browsers without further username and password inputs from the user. SAP Logon Tickets can also be a vehicle for enabling single sign-on across SAP boundaries; in some cases, logon tickets can be used to authenticate into 3rd party applications such"
"error message in the page cache, as this would lead it to display the error again when the user tries to load the same page - even after the network is back up. The error message must not be cached under the page's URL; until the browser is able to successfully load the page, whenever the user tries to load the page, the browser must make a new attempt. A frustrating aspect of negative caches is that the user may put a great effort into troubleshooting the problem, and then after determining and removing the root cause, the error still"
"HTTP response splitting HTTP response splitting is a form of web application vulnerability, resulting from the failure of the application or its environment to properly sanitize input values. It can be used to perform cross-site scripting attacks, cross-user defacement, web cache poisoning, and similar exploits. The attack consists of making the server print a carriage return (CR, ASCII 0x0D) line feed (LF, ASCII 0x0A) sequence followed by content supplied by the attacker in the header section of its response, typically by including them in input fields sent to the application. Per the HTTP standard (RFC 2616), headers are separated by"
"as duplicate checklist items and erroneous responses to frequently asked questions. ORCA exclusively used an HTTP Secure (HTTPS) connection but its designers had apparently forgotten to redirect those attempting to use the equivalent HTTP address to the HTTPS address. Anyone who incorrectly typed in an address beginning with ""www"" was unable to reach the system, causing many volunteers to assume that it was down. Other volunteers reported being unable to get through to technical support and found themselves receiving either a busy signal or a ""try again later"" message. One volunteer wrote on a Romney campaign message board: ""I have"