httputils.php ➔ http_rangeRequest() - Code Metrics - Inspection of "translate html and text string for signature" - splitbrain/dokuwiki - Measure and Improve Code Quality continuously with Scrutinizer

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by Gerrit

created 2016-05-27 22:39 UTC

httputils.php ➔ http_rangeRequest() F

↳ Parent: Project

Complexity

Conditions	19
Paths	686

Size

Total Lines	83
Code Lines	56

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	19
eloc	56
nc	686
nop	3
dl	0
loc	83
rs	2.4096
c	0
b	0
f	0

How to fix Long Method Complexity

<?php
/**
 * Utilities for handling HTTP related tasks
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <[email protected]>
 */

define('HTTP_MULTIPART_BOUNDARY','D0KuW1K1B0uNDARY');
define('HTTP_HEADER_LF',"\r\n");
define('HTTP_CHUNK_SIZE',16*1024);

/**
 * Checks and sets HTTP headers for conditional HTTP requests
 *
 * @author   Simon Willison <[email protected]>
 * @link     http://simonwillison.net/2003/Apr/23/conditionalGet/
 *
 * @param    int $timestamp lastmodified time of the cache file
 * @returns  void or exits with previously header() commands executed
 */
function http_conditionalRequest($timestamp){
    // A PHP implementation of conditional get, see
    //   http://fishbowl.pastiche.org/2002/10/21/http_conditional_get_for_rss_hackers/
    $last_modified = substr(gmdate('r', $timestamp), 0, -5).'GMT';
    $etag = '"'.md5($last_modified).'"';
    // Send the headers
    header("Last-Modified: $last_modified");
    header("ETag: $etag");
    // See if the client has provided the required headers
    if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
        $if_modified_since = stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']);
    }else{
        $if_modified_since = false;
    }

    if (isset($_SERVER['HTTP_IF_NONE_MATCH'])){
        $if_none_match = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
    }else{
        $if_none_match = false;
    }

    if (!$if_modified_since && !$if_none_match){
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
        return;
    }

    // At least one of the headers is there - check them
    if ($if_none_match && $if_none_match != $etag) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
        return; // etag is there but doesn't match
    }

    if ($if_modified_since && $if_modified_since != $last_modified) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
        return; // if-modified-since is there but doesn't match
    }

    // Nothing has changed since their last request - serve a 304 and exit
    header('HTTP/1.0 304 Not Modified');

    // don't produce output, even if compression is on
    @ob_end_clean();
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
    exit;
}

/**
 * Let the webserver send the given file via x-sendfile method
 *
 * @author Chris Smith <[email protected]>
 *
 * @param string $file absolute path of file to send
 * @returns  void or exits with previous header() commands executed
 */
function http_sendfile($file) {
    global $conf;

    //use x-sendfile header to pass the delivery to compatible web servers
    if($conf['xsendfile'] == 1){
        header("X-LIGHTTPD-send-file: $file");
        ob_end_clean();
        exit;
    }elseif($conf['xsendfile'] == 2){
        header("X-Sendfile: $file");
        ob_end_clean();
        exit;
    }elseif($conf['xsendfile'] == 3){
        // FS#2388 nginx just needs the relative path.
        $file = DOKU_REL.substr($file, strlen(fullpath(DOKU_INC)) + 1);
        header("X-Accel-Redirect: $file");
        ob_end_clean();
        exit;
    }
}

/**
 * Send file contents supporting rangeRequests
 *
 * This function exits the running script
 *
 * @param resource $fh - file handle for an already open file
 * @param int $size     - size of the whole file
 * @param int $mime     - MIME type of the file
 *
 * @author Andreas Gohr <[email protected]>
 */
function http_rangeRequest($fh,$size,$mime){
    $ranges  = array();
    $isrange = false;

    header('Accept-Ranges: bytes');

    if(!isset($_SERVER['HTTP_RANGE'])){
        // no range requested - send the whole file
        $ranges[] = array(0,$size,$size);
    }else{
        $t = explode('=', $_SERVER['HTTP_RANGE']);
        if (!$t[0]=='bytes') {
            // we only understand byte ranges - send the whole file
            $ranges[] = array(0,$size,$size);
        }else{
            $isrange = true;
            // handle multiple ranges
            $r = explode(',',$t[1]);
            foreach($r as $x){
                $p = explode('-', $x);
                $start = (int)$p[0];
                $end   = (int)$p[1];
                if (!$end) $end = $size - 1;
                if ($start > $end || $start > $size || $end > $size){
                    header('HTTP/1.1 416 Requested Range Not Satisfiable');
                    print 'Bad Range Request!';
                    exit;
                }
                $len = $end - $start + 1;
                $ranges[] = array($start,$end,$len);
            }
        }
    }
    $parts = count($ranges);

    // now send the type and length headers
    if(!$isrange){
        header("Content-Type: $mime",true);
    }else{
        header('HTTP/1.1 206 Partial Content');
        if($parts == 1){
            header("Content-Type: $mime",true);
        }else{
            header('Content-Type: multipart/byteranges; boundary='.HTTP_MULTIPART_BOUNDARY,true);
        }
    }

    // send all ranges
    for($i=0; $i<$parts; $i++){
        list($start,$end,$len) = $ranges[$i];

        // multipart or normal headers
        if($parts > 1){
            echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.HTTP_HEADER_LF;
            echo "Content-Type: $mime".HTTP_HEADER_LF;
            echo "Content-Range: bytes $start-$end/$size".HTTP_HEADER_LF;
            echo HTTP_HEADER_LF;
        }else{
            header("Content-Length: $len");
            if($isrange){
                header("Content-Range: bytes $start-$end/$size");
            }
        }

        // send file content
        fseek($fh,$start); //seek to start of range
        $chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
        while (!feof($fh) && $chunk > 0) {
            @set_time_limit(30); // large files can take a lot of time
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
            print fread($fh, $chunk);
            flush();
            $len -= $chunk;
            $chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
        }
    }
    if($parts > 1){
        echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.'--'.HTTP_HEADER_LF;
    }

    // everything should be done here, exit (or return if testing)
    if (defined('SIMPLE_TEST')) return;
    exit;
}

/**
 * Check for a gzipped version and create if necessary
 *
 * return true if there exists a gzip version of the uncompressed file
 * (samepath/samefilename.sameext.gz) created after the uncompressed file
 *
 * @author Chris Smith <[email protected]>
 *
 * @param string $uncompressed_file
 * @return bool
 */
function http_gzip_valid($uncompressed_file) {
    if(!DOKU_HAS_GZIP) return false;

    $gzip = $uncompressed_file.'.gz';
    if (filemtime($gzip) < filemtime($uncompressed_file)) {    // filemtime returns false (0) if file doesn't exist
        return copy($uncompressed_file, 'compress.zlib://'.$gzip);
    }

    return true;
}

/**
 * Set HTTP headers and echo cachefile, if useable
 *
 * This function handles output of cacheable resource files. It ses the needed
 * HTTP headers. If a useable cache is present, it is passed to the web server
 * and the script is terminated.
 *
 * @param string $cache cache file name
 * @param bool   $cache_ok    if cache can be used
 */
function http_cached($cache, $cache_ok) {
    global $conf;

    // check cache age & handle conditional request
    // since the resource files are timestamped, we can use a long max age: 1 year
    header('Cache-Control: public, max-age=31536000');
    header('Pragma: public');
    if($cache_ok){
        http_conditionalRequest(filemtime($cache));
        if($conf['allowdebug']) header("X-CacheUsed: $cache");

        // finally send output
        if ($conf['gzip_output'] && http_gzip_valid($cache)) {
            header('Vary: Accept-Encoding');
            header('Content-Encoding: gzip');
            readfile($cache.".gz");
        } else {
            http_sendfile($cache);
            readfile($cache);
        }
        exit;
    }

    http_conditionalRequest(time());
}

/**
 * Cache content and print it
 *
 * @param string $file file name
 * @param string $content
 */
function http_cached_finish($file, $content) {
    global $conf;

    // save cache file
    io_saveFile($file, $content);
    if(DOKU_HAS_GZIP) io_saveFile("$file.gz",$content);

    // finally send output
    if ($conf['gzip_output'] && DOKU_HAS_GZIP) {
        header('Vary: Accept-Encoding');
        header('Content-Encoding: gzip');
        print gzencode($content,9,FORCE_GZIP);
    } else {
        print $content;
    }
}

/**
 * Fetches raw, unparsed POST data
 *
 * @return string
 */
function http_get_raw_post_data() {
    static $postData = null;
    if ($postData === null) {
        $postData = file_get_contents('php://input');
    }
    return $postData;
}

/**
 * Set the HTTP response status and takes care of the used PHP SAPI
 *
 * Inspired by CodeIgniter's set_status_header function
 *
 * @param int    $code
 * @param string $text
 */
function http_status($code = 200, $text = '') {
    static $stati = array(
        200 => 'OK',
        201 => 'Created',
        202 => 'Accepted',
        203 => 'Non-Authoritative Information',
        204 => 'No Content',
        205 => 'Reset Content',
        206 => 'Partial Content',

        300 => 'Multiple Choices',
        301 => 'Moved Permanently',
        302 => 'Found',
        304 => 'Not Modified',
        305 => 'Use Proxy',
        307 => 'Temporary Redirect',

        400 => 'Bad Request',
        401 => 'Unauthorized',
        403 => 'Forbidden',
        404 => 'Not Found',
        405 => 'Method Not Allowed',
        406 => 'Not Acceptable',
        407 => 'Proxy Authentication Required',
        408 => 'Request Timeout',
        409 => 'Conflict',
        410 => 'Gone',
        411 => 'Length Required',
        412 => 'Precondition Failed',
        413 => 'Request Entity Too Large',
        414 => 'Request-URI Too Long',
        415 => 'Unsupported Media Type',
        416 => 'Requested Range Not Satisfiable',
        417 => 'Expectation Failed',

        500 => 'Internal Server Error',
        501 => 'Not Implemented',
        502 => 'Bad Gateway',
        503 => 'Service Unavailable',
        504 => 'Gateway Timeout',
        505 => 'HTTP Version Not Supported'
    );

    if($text == '' && isset($stati[$code])) {
        $text = $stati[$code];
    }

    $server_protocol = (isset($_SERVER['SERVER_PROTOCOL'])) ? $_SERVER['SERVER_PROTOCOL'] : false;

    if(substr(php_sapi_name(), 0, 3) == 'cgi' || defined('SIMPLE_TEST')) {
        header("Status: {$code} {$text}", true);
    } elseif($server_protocol == 'HTTP/1.1' OR $server_protocol == 'HTTP/1.0') {
        header($server_protocol." {$code} {$text}", true, $code);
    } else {
        header("HTTP/1.1 {$code} {$text}", true, $code);
    }
}


1			<?php
2			/**
3			* Utilities for handling HTTP related tasks
4			*
5			* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
6			* @author Andreas Gohr <[email protected]>
7			*/
8
9			define('HTTP_MULTIPART_BOUNDARY','D0KuW1K1B0uNDARY');
10			define('HTTP_HEADER_LF',"\r\n");
11			define('HTTP_CHUNK_SIZE',16*1024);
12
13			/**
14			* Checks and sets HTTP headers for conditional HTTP requests
15			*
16			* @author Simon Willison <[email protected]>
17			* @link http://simonwillison.net/2003/Apr/23/conditionalGet/
18			*
19			* @param int $timestamp lastmodified time of the cache file
20			* @returns void or exits with previously header() commands executed
21			*/
22			function http_conditionalRequest($timestamp){
23			// A PHP implementation of conditional get, see
24			// http://fishbowl.pastiche.org/2002/10/21/http_conditional_get_for_rss_hackers/
25			$last_modified = substr(gmdate('r', $timestamp), 0, -5).'GMT';
26			$etag = '"'.md5($last_modified).'"';
27			// Send the headers
28			header("Last-Modified: $last_modified");
29			header("ETag: $etag");
30			// See if the client has provided the required headers
31			if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
32			$if_modified_since = stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']);
33			}else{
34			$if_modified_since = false;
35			}
36
37			if (isset($_SERVER['HTTP_IF_NONE_MATCH'])){
38			$if_none_match = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
39			}else{
40			$if_none_match = false;
41			}
42
43			if (!$if_modified_since && !$if_none_match){
			0 ignored issues – show Bug Best Practice introduced 2015-11-25 07:06 UTC by Report Bug Copy Issue Report The expression `$if_modified_since` of type `string\|false` is loosely compared to `false`; this is ambiguous if the string can be empty. You might want to explicitly use `=== false` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history... Bug Best Practice introduced 2015-11-25 07:06 UTC by Report Bug Copy Issue Report The expression `$if_none_match` of type `string\|false` is loosely compared to `false`; this is ambiguous if the string can be empty. You might want to explicitly use `=== false` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
44			return;
45			}
46
47			// At least one of the headers is there - check them
48			if ($if_none_match && $if_none_match != $etag) {
			0 ignored issues – show Bug Best Practice introduced 2015-11-25 07:06 UTC by Report Bug Copy Issue Report The expression `$if_none_match` of type `string\|false` is loosely compared to `true`; this is ambiguous if the string can be empty. You might want to explicitly use `!== false` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
49			return; // etag is there but doesn't match
50			}
51
52			if ($if_modified_since && $if_modified_since != $last_modified) {
			0 ignored issues – show Bug Best Practice introduced 2015-11-25 07:06 UTC by Report Bug Copy Issue Report The expression `$if_modified_since` of type `string\|false` is loosely compared to `true`; this is ambiguous if the string can be empty. You might want to explicitly use `!== false` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
53			return; // if-modified-since is there but doesn't match
54			}
55
56			// Nothing has changed since their last request - serve a 304 and exit
57			header('HTTP/1.0 304 Not Modified');
58
59			// don't produce output, even if compression is on
60			@ob_end_clean();
			1 ignored issue – show Security Best Practice introduced 2015-11-25 07:06 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
61			exit;
62			}
63
64			/**
65			* Let the webserver send the given file via x-sendfile method
66			*
67			* @author Chris Smith <[email protected]>
68			*
69			* @param string $file absolute path of file to send
70			* @returns void or exits with previous header() commands executed
71			*/
72			function http_sendfile($file) {
73			global $conf;
74
75			//use x-sendfile header to pass the delivery to compatible web servers
76			if($conf['xsendfile'] == 1){
77			header("X-LIGHTTPD-send-file: $file");
78			ob_end_clean();
79			exit;
80			}elseif($conf['xsendfile'] == 2){
81			header("X-Sendfile: $file");
82			ob_end_clean();
83			exit;
84			}elseif($conf['xsendfile'] == 3){
85			// FS#2388 nginx just needs the relative path.
86			$file = DOKU_REL.substr($file, strlen(fullpath(DOKU_INC)) + 1);
87			header("X-Accel-Redirect: $file");
88			ob_end_clean();
89			exit;
90			}
91			}
92
93			/**
94			* Send file contents supporting rangeRequests
95			*
96			* This function exits the running script
97			*
98			* @param resource $fh - file handle for an already open file
99			* @param int $size - size of the whole file
100			* @param int $mime - MIME type of the file
101			*
102			* @author Andreas Gohr <[email protected]>
103			*/
104			function http_rangeRequest($fh,$size,$mime){
105			$ranges = array();
106			$isrange = false;
107
108			header('Accept-Ranges: bytes');
109
110			if(!isset($_SERVER['HTTP_RANGE'])){
111			// no range requested - send the whole file
112			$ranges[] = array(0,$size,$size);
113			}else{
114			$t = explode('=', $_SERVER['HTTP_RANGE']);
115			if (!$t[0]=='bytes') {
116			// we only understand byte ranges - send the whole file
117			$ranges[] = array(0,$size,$size);
118			}else{
119			$isrange = true;
120			// handle multiple ranges
121			$r = explode(',',$t[1]);
122			foreach($r as $x){
123			$p = explode('-', $x);
124			$start = (int)$p[0];
125			$end = (int)$p[1];
126			if (!$end) $end = $size - 1;
127			if ($start > $end \|\| $start > $size \|\| $end > $size){
128			header('HTTP/1.1 416 Requested Range Not Satisfiable');
129			print 'Bad Range Request!';
130			exit;
131			}
132			$len = $end - $start + 1;
133			$ranges[] = array($start,$end,$len);
134			}
135			}
136			}
137			$parts = count($ranges);
138
139			// now send the type and length headers
140			if(!$isrange){
141			header("Content-Type: $mime",true);
142			}else{
143			header('HTTP/1.1 206 Partial Content');
144			if($parts == 1){
145			header("Content-Type: $mime",true);
146			}else{
147			header('Content-Type: multipart/byteranges; boundary='.HTTP_MULTIPART_BOUNDARY,true);
148			}
149			}
150
151			// send all ranges
152			for($i=0; $i<$parts; $i++){
153			list($start,$end,$len) = $ranges[$i];
154
155			// multipart or normal headers
156			if($parts > 1){
157			echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.HTTP_HEADER_LF;
158			echo "Content-Type: $mime".HTTP_HEADER_LF;
159			echo "Content-Range: bytes $start-$end/$size".HTTP_HEADER_LF;
160			echo HTTP_HEADER_LF;
161			}else{
162			header("Content-Length: $len");
163			if($isrange){
164			header("Content-Range: bytes $start-$end/$size");
165			}
166			}
167
168			// send file content
169			fseek($fh,$start); //seek to start of range
170			$chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
171			while (!feof($fh) && $chunk > 0) {
172			@set_time_limit(30); // large files can take a lot of time
			1 ignored issue – show Security Best Practice introduced 2015-11-25 07:06 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
173			print fread($fh, $chunk);
174			flush();
175			$len -= $chunk;
176			$chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
177			}
178			}
179			if($parts > 1){
180			echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.'--'.HTTP_HEADER_LF;
181			}
182
183			// everything should be done here, exit (or return if testing)
184			if (defined('SIMPLE_TEST')) return;
185			exit;
186			}
187
188			/**
189			* Check for a gzipped version and create if necessary
190			*
191			* return true if there exists a gzip version of the uncompressed file
192			* (samepath/samefilename.sameext.gz) created after the uncompressed file
193			*
194			* @author Chris Smith <[email protected]>
195			*
196			* @param string $uncompressed_file
197			* @return bool
198			*/
199			function http_gzip_valid($uncompressed_file) {
200			if(!DOKU_HAS_GZIP) return false;
201
202			$gzip = $uncompressed_file.'.gz';
203			if (filemtime($gzip) < filemtime($uncompressed_file)) { // filemtime returns false (0) if file doesn't exist
204			return copy($uncompressed_file, 'compress.zlib://'.$gzip);
205			}
206
207			return true;
208			}
209
210			/**
211			* Set HTTP headers and echo cachefile, if useable
212			*
213			* This function handles output of cacheable resource files. It ses the needed
214			* HTTP headers. If a useable cache is present, it is passed to the web server
215			* and the script is terminated.
216			*
217			* @param string $cache cache file name
218			* @param bool $cache_ok if cache can be used
219			*/
220			function http_cached($cache, $cache_ok) {
221			global $conf;
222
223			// check cache age & handle conditional request
224			// since the resource files are timestamped, we can use a long max age: 1 year
225			header('Cache-Control: public, max-age=31536000');
226			header('Pragma: public');
227			if($cache_ok){
228			http_conditionalRequest(filemtime($cache));
229			if($conf['allowdebug']) header("X-CacheUsed: $cache");
230
231			// finally send output
232			if ($conf['gzip_output'] && http_gzip_valid($cache)) {
233			header('Vary: Accept-Encoding');
234			header('Content-Encoding: gzip');
235			readfile($cache.".gz");
236			} else {
237			http_sendfile($cache);
238			readfile($cache);
239			}
240			exit;
241			}
242
243			http_conditionalRequest(time());
244			}
245
246			/**
247			* Cache content and print it
248			*
249			* @param string $file file name
250			* @param string $content
251			*/
252			function http_cached_finish($file, $content) {
253			global $conf;
254
255			// save cache file
256			io_saveFile($file, $content);
257			if(DOKU_HAS_GZIP) io_saveFile("$file.gz",$content);
258
259			// finally send output
260			if ($conf['gzip_output'] && DOKU_HAS_GZIP) {
261			header('Vary: Accept-Encoding');
262			header('Content-Encoding: gzip');
263			print gzencode($content,9,FORCE_GZIP);
264			} else {
265			print $content;
266			}
267			}
268
269			/**
270			* Fetches raw, unparsed POST data
271			*
272			* @return string
273			*/
274			function http_get_raw_post_data() {
275			static $postData = null;
276			if ($postData === null) {
277			$postData = file_get_contents('php://input');
278			}
279			return $postData;
280			}
281
282			/**
283			* Set the HTTP response status and takes care of the used PHP SAPI
284			*
285			* Inspired by CodeIgniter's set_status_header function
286			*
287			* @param int $code
288			* @param string $text
289			*/
290			function http_status($code = 200, $text = '') {
291			static $stati = array(
292			200 => 'OK',
293			201 => 'Created',
294			202 => 'Accepted',
295			203 => 'Non-Authoritative Information',
296			204 => 'No Content',
297			205 => 'Reset Content',
298			206 => 'Partial Content',
299
300			300 => 'Multiple Choices',
301			301 => 'Moved Permanently',
302			302 => 'Found',
303			304 => 'Not Modified',
304			305 => 'Use Proxy',
305			307 => 'Temporary Redirect',
306
307			400 => 'Bad Request',
308			401 => 'Unauthorized',
309			403 => 'Forbidden',
310			404 => 'Not Found',
311			405 => 'Method Not Allowed',
312			406 => 'Not Acceptable',
313			407 => 'Proxy Authentication Required',
314			408 => 'Request Timeout',
315			409 => 'Conflict',
316			410 => 'Gone',
317			411 => 'Length Required',
318			412 => 'Precondition Failed',
319			413 => 'Request Entity Too Large',
320			414 => 'Request-URI Too Long',
321			415 => 'Unsupported Media Type',
322			416 => 'Requested Range Not Satisfiable',
323			417 => 'Expectation Failed',
324
325			500 => 'Internal Server Error',
326			501 => 'Not Implemented',
327			502 => 'Bad Gateway',
328			503 => 'Service Unavailable',
329			504 => 'Gateway Timeout',
330			505 => 'HTTP Version Not Supported'
331			);
332
333			if($text == '' && isset($stati[$code])) {
334			$text = $stati[$code];
335			}
336
337			$server_protocol = (isset($_SERVER['SERVER_PROTOCOL'])) ? $_SERVER['SERVER_PROTOCOL'] : false;
338
339			if(substr(php_sapi_name(), 0, 3) == 'cgi' \|\| defined('SIMPLE_TEST')) {
340			header("Status: {$code} {$text}", true);
341			} elseif($server_protocol == 'HTTP/1.1' OR $server_protocol == 'HTTP/1.0') {
342			header($server_protocol." {$code} {$text}", true, $code);
343			} else {
344			header("HTTP/1.1 {$code} {$text}", true, $code);
345			}
346			}
347

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httputils.php ➔ http_rangeRequest() F

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