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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="">
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<title>HTTP Status Codes</title>
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<link href="css/bootstrap.min.css" rel="stylesheet">
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<link href="lecture8.css" rel="stylesheet">
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</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="#">WebTek 2017</a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li><a href="index.html">Home</a></li>
<li><a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Prelim <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="lecture%201.html">Internet and the World Wide Web</a></li>
<li><a href="lecture%202.html">Hypertext Transfer Protocol (HTTP)</a></li>
<li><a href="lecture%203.html">Hypertext Resource Addressing</a></li>
<li><a href="lecture%204.html">HTTP Request Message</a></li>
<li><a href="lecture%205.html">HTTP Response Message</a></li>
<li><a href="lecture%206.html">HTTP Request Methods</a></li>
<li><a href="lecture%207.html">HTTP Message Headers</a></li>
<li><a href="lecture%208.html">HTTP Status Codes</a></li>
</ul>
</li>
<li><a href="#">Midterm</a></li>
<li><a href="#">Final</a></li>
</ul>
</div>
</div>
</nav>
<div class="container-fluid">
<div class="row">
<div class="col-sm-3 col-md-2 sidebar">
<ul class="nav nav-sidebar">
<li class="active"><a href="#httpsc">Informational (1xx)</a></li>
<li><a href="#2xx">Success (2xx)</a></li>
<li><a href="#3xx">Redirection (3xx)</a></li>
<li><a href="#4xx">Client Error (4xx)</a></li>
<li><a href="#5xx">Server Error (5xx)</a></li>
</ul>
</div>
<div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">
<h1 class="page-header" id="httpsc">HTTP Status Codes</h1>
<div class="sc-con">
<div class="status sc">
<strong>Informational</strong> (1xx)
</div>
<p class="sc-definition">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.</p>
<p class="sc-ref">From https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html</p>
<hr>
<div class="code">
<h5><strong>100</strong> Continue</h5>
<hr>
<p>This indicates that the client should proceed with the remaining part of the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/100">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>101</strong> Switching Protocol</h5>
<hr>
<p>This indicates that the client requested to switch protocol and server accepts the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/101">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>102</strong> Processing (WebDAV)</h5>
<hr>
<p>This informs the client that the server accepted the request but the request is not completed yet.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/102">Learn More</a>
</p>
</div>
</div>
<div class="sc-container" id="2xx">
<div class="status sc">
<strong>Success</strong> (2xx)
</div>
<p class="sc-definition">This class of status code indicates that the client's request was successfully received, understood, and accepted.</p>
<p class="sc-ref">From https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html</p>
<hr>
<div class="code">
<h5><strong>200</strong> OK</h5>
<hr>
<p>The status code is used to indicate that the request was successful.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/200">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>201</strong> Created</h5>
<hr>
<p>The request has been completed and a new resource is created.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/201">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>202</strong> Accepted</h5>
<hr>
<p>The request has been accepted but has not been completed.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/202">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>203</strong> Non-Authoritative Information</h5>
<hr>
<p>Certain part of the response are not coming from the origin server.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/203">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>204</strong> No Content</h5>
<hr>
<p>The request was completed but no content needed to be return.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/204">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>205</strong> Reset Content</h5>
<hr>
<p>The request was completed and client should reset the document view.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/205">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>206</strong> Partial Content</h5>
<hr>
<p>Server tells that this is not the whole resource.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/206">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>207</strong> Multi-Status (WebDAV)</h5>
<hr>
<p>This provides multiple status for independent operations.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/207">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>208</strong> Already Reported (WebDAV)</h5>
<hr>
<p>This indicates avoiding enumeration of internal members of multiple bindings repeatedly.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/208">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>226</strong> IM Used</h5>
<hr>
<p>The GET request for the resource is completed and the response is a representation of the result of one or more instance-manipulations applied to the current instance.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/226">Learn More</a>
</p>
</div>
</div>
<div class="sc-container" id="3xx">
<div class="status sc">
<strong>Redirection</strong> (3xx)
</div>
<p class="sc-definition">This class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request.</p>
<p class="sc-ref">From https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html</p>
<hr>
<div class="code">
<h5><strong>300</strong> Multiple Choices</h5>
<hr>
<p>This provides certain choices to proceed with the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/300">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>301</strong> Moved Permanently</h5>
<hr>
<p>The resource is no longer residing at the current URI.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/301">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>302</strong> Found</h5>
<hr>
<p>The resource is temporarily residing at the different URI.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/302">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>303</strong> See Other</h5>
<hr>
<p>The response to the request can be located from different URI with the use of GET method.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/303">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>304</strong> Not Modified</h5>
<hr>
<p>This indicates that the resource has not been modified since the last request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/304">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>305</strong> Use Proxy</h5>
<hr>
<p>The resource requested must accessed through the use of proxy.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/305">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>306</strong> (Unused)</h5>
<hr>
<p>This status code is no longer used but was used in the previous version and currently reserved.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/306">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>307</strong> Temporary Redirect</h5>
<hr>
<p>The resource requested is temporarily residing at the different URI.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/307">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>308</strong> Permanent Redirect (experimental)</h5>
<hr>
<p>The request must be done with another URI.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/308">Learn More</a>
</p>
</div>
</div>
<div class="sc-container" id="4xx">
<div class="status sc">
<strong>Client Error</strong> (4xx)
</div>
<p class="sc-definition">The class of status code is intended for cases in which the client seems to have erred.</p>
<p class="sc-ref">From https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html</p>
<hr>
<div class="code">
<h5><strong>400</strong> Bad Request</h5>
<hr>
<p>The request cannot be completed due to bad syntax.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>401</strong> Unauthorized</h5>
<hr>
<p>The request requires user authentication.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/401">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>402</strong> Payment Required</h5>
<hr>
<p>This status code is reserved for future use and intended for request that needs payment of digital cash.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/402">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>403</strong> Forbidden</h5>
<hr>
<p>The server is refusing to respond with the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/403">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>404</strong> Not Found</h5>
<hr>
<p>The requested resource cannot be found by the server.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/404">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>405</strong> Method Not Allowed</h5>
<hr>
<p>The request method is not supported by the resource.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/405">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>406</strong> Not Acceptable</h5>
<hr>
<p>The resource requested is only capable of generating response which is not acceptable according to the accept headers sent in the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/406">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>407</strong> Proxy Authentication Required</h5>
<hr>
<p>To proceed, it is required that the client must first authenticate itself with the proxy.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/407">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>408</strong> Request Timeout</h5>
<hr>
<p>The client did not make any request within the time frame given by the server to wait.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/408">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>409</strong> Conflict</h5>
<hr>
<p>Whatever request cannot be done becauese of conflict.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/409">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>410</strong> Gone</h5>
<hr>
<p>Resource is no longer available.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/410">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>411</strong> Length Required</h5>
<hr>
<p>Server expecting content length.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/411">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>412</strong> Precondition Failed</h5>
<hr>
<p>Condition has failed, can not proceed to the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/412">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>413</strong> Request Entity Too Large</h5>
<hr>
<p>Request Entity is too large to be handled by the server.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/413">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>414</strong> Request-URI Too Long</h5>
<hr>
<p>Request-URI is too long to be handled by the server.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/414">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>415</strong> Unsupported Media Type</h5>
<hr>
<p>The server if refusing the request because the format is not supported.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/415">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>416</strong> Requested Range Not Satisfiable</h5>
<hr>
<p>The request cannot be supplied by the server.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/416">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>417</strong> Expectation Failed</h5>
<hr>
<p>The server cannot meet the requirements of the Expect request-header field.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/417">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>418</strong> I'm a teapot (RFC 2324)</h5>
<hr>
<p>This code is one of traditional IETF April Fools joke created in 1998.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/418">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>420</strong> Enhance Your Calm (Twitter)</h5>
<hr>
<p>This code is returned by the Twitter Search and Trends API to client when being rate limited.
</p>
</div>
<div class="code">
<h5><strong>422</strong> Unprocessable Entity (WebDAV)</h5>
<hr>
<p>This indicates that the server was able to understand the content type of the request but unable to to process the contained instructions.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/422">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>423</strong> Locked (WebDAV)</h5>
<hr>
<p>This indicates that the resource requested is locked.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/423">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>424</strong> Failed Dependency (WebDAV)</h5>
<hr>
<p>This indicates that the current request failed because of the previous failure of request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/424">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>425</strong> Reserved for WebDAV</h5>
<hr>
<p>This status code is reserved for the "WebDAV Advanced Collections Protocol".
</p>
</div>
<div class="code">
<h5><strong>426</strong> Upgrade Required</h5>
<hr>
<p>This allows a server to state the precise protocol extensions, a given resource must be served with.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/426">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>428</strong> Precondition Required</h5>
<hr>
<p>This indicates that the origin server requires the request to be conditional.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/428">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>429</strong> Too Many Requests</h5>
<hr>
<p>This indicates that the client has sent too many requests in a given amount of time.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/429">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>431</strong> Request Header Fields Too Large</h5>
<hr>
<p>This indicates that the server do not accept the request due to large header fields.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/431">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>444</strong> No Response (Nginx)</h5>
<hr>
<p>The server returns no information to the client and closes the connection.
</p>
</div>
<div class="code">
<h5><strong>449</strong> Retry With (Microsoft)</h5>
<hr>
<p>This status code is a Microsoft extension which indicates that the request should be retried after performing the appropriate action.
</p>
</div>
<div class="code">
<h5><strong>450</strong> Blocked by Windows Parental Controls (Microsoft)</h5>
<hr>
<p>This status code is a Microsoft extension which is given when Windows Parental Controls are turned on and are blocking access to the given webpage.
</p>
</div>
<div class="code">
<h5><strong>451</strong> Unavailable For Legal Reasons</h5>
<hr>
<p>This is used when resource access is denied for legal reasons.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/451">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>499</strong> Client Closed Request (Nginx)</h5>
<hr>
<p>This status code is a Nginx HTTP server extension which is used to log the case when the connection is closed by client while HTTP server is processing its request, making server unable to send the HTTP header back.
</p>
</div>
</div>
<div class="sc-container" id="5xx">
<div class="status sc">
<strong>Server Error</strong> (5xx)
</div>
<p class="sc-definition">This class of status codes indicate cases in which the server is aware that it has erred or is incapable of performing the request.</p>
<p class="sc-ref">From https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html</p>
<hr>
<div class="code">
<h5><strong>500</strong> Internal Server Error</h5>
<hr>
<p>The server encountered an unexpected condition preventing it to respond on the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/500">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>501</strong> Not Implemented</h5>
<hr>
<p>The server does not recognize the request method.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/501">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>502</strong> Bad Gateway</h5>
<hr>
<p>This indicates that the server while acting as a gateway or proxy, received an invalid response from the upstream server.
</p>
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/502">Learn More</a>
</div>
<div class="code">
<h5><strong>503</strong> Service Unavailable</h5>
<hr>
<p>The server is under maintenance or overloaded resulting to unable to respond to request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/503">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>504</strong> Gateway Timeout</h5>
<hr>
<p>This indicates that the server while acting as a gateway or proxy, did not receive a timely response from the upstream server.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/504">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>505</strong> HTTP Version Not Supported</h5>
<hr>
<p>The HTTP version used in the request is not supported by the server.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/505">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>506</strong> Variant Also Negotiates (Experimental)</h5>
<hr>
<p>This indicates that the server has an internal configuration error.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/506">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>507</strong> Insufficient Storage (WebDAV)</h5>
<hr>
<p>This indicates that the method could not be performed on the resource because the server cannot store the representation needed to successfully complete the request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/507">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>508</strong> Loop Detected (WebDAV)</h5>
<hr>
<p>This indicates that the server canceled an operation because it encountered an infinite loop while processing a request.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/508">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>509</strong> Bandwidth Limit Exceeded (Apache)</h5>
<hr>
<p>This status code is used by many servers but not specified in any RFCs.
</p>
</div>
<div class="code">
<h5><strong>510</strong> Not Extended</h5>
<hr>
<p>This indicates that a further extensions to the request are required for the server to complete it.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/510">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>511</strong> Network Authentication Required</h5>
<hr>
<p>This indicates that the client needs to authenticate to gain network access.
<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/511">Learn More</a>
</p>
</div>
<div class="code">
<h5><strong>598</strong> Network read timeout error</h5>
<hr>
<p>This status code is not specified in any RFCs but is used by some HTTP proxies to signal a network read timeout.
</p>
</div>
<div class="code">
<h5><strong>599</strong> Network connect timeout error</h5>
<hr>
<p>This status code is not specified in any RFCs but is used by some HTTP proxies to signal a network connect timeout.
</p>
</div>
</div>
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<p>References:</p>
<p><a href="http://www.restapitutorial.com/httpstatuscodes.html">http://www.restapitutorial.com/httpstatuscodes.html</a></p>
<p><a href="https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html</a></p>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Status">https://developer.mozilla.org/en-US/docs/Web/HTTP/Status</a></p>
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