Occasionally, a piece in a mode such as Mixolydian or Dorian is written with a major or minor key signature appropriate to the tonic, and accidentals throughout the piece. It does not discriminate between a major key and its relative minor the piece may modulate to a different key if the modulation is brief, it may not involve a change of key signature, being indicated instead with accidentals. The key signature is not a reliable guide to the key of a written piece. However, the chords most often used in a piece in a particular key are those that contain the notes in the corresponding scale, and conventional progressions of these chords, particularly cadences, orient the listener around the tonic. Methods that establish the key for a particular piece can be complicated to explain, and vary over music history. Longer pieces in the classical repertoire may have sections in contrasting keys. The key may be major or minor, although major is assumed in a phrase like "this piece is in C." Popular songs are usually in a key, and so is classical music during the common practice period, about 1650–1900. Other notes and chords in the piece create varying degrees of tension, resolved when the tonic note or chord returns. In music theory, the key of a piece is the tonic note and chord that provides a subjective sense of arrival and rest. The HTTP specification suggests the phrase "Not Found" and many web servers by default issue an HTML page that includes both the 404 code and the "Not Found" phrase. HTTP's use of three-digit codes is similar to the use of such codes in earlier protocols such as FTP and NNTP.Īt the HTTP level, a 404 response code is followed by a human-readable "reason phrase". The following two digits indicate the specific error encountered. In the code 404, the first digit indicates a client error, such as a mistyped Uniform Resource Locator (URL). When communicating via HTTP, a server is required to respond to a 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. The web site hosting server will typically generate a "404 Not Found" web page when a user attempts to follow a broken or dead link hence the 404 error is one of the most recognizable errors encountered on the World Wide Web. The 404 or Not Found error message is an HTTP standard response code indicating that the client was able to communicate with a given server, but the server could not find what was requested.
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