header

(PHP 4, PHP 5)

headerHam bir HTTP başlığı gönderir

Açıklama

void header ( string $dizge [, bool $değiştir = true [, int $http_yanıt_kodu ]] )

header() işlevi ham bir HTTP başlığı göndermek için kulanılır. HTTP başlıkları hakkında ayrıntılı bilgi edinmek için » HTTP/1.1 Belirtimi'ne bakınız.

header() işlevinin normal HTML etiketleri ve dosya veya PHP'deki boş satırlar dahil herhangi bir çıktıdan önce çağrılması gerektiğini unutmayınız. header() çağrısından önce sıkça yapılan hatalar: kodu include, require veya başka bir dosya okuma işlevi ile okumak; betik HTML'ye gömülüyse betiğin veya dosyanın başındaki boşluklar veya boş satırlar.

<html>
<?php
/* Bu bir hata verecektir.  header() çağrısından
 * önce hiçbir satırlar olmamalıydı. */
header('Location: http://localhost/');
?>

Değiştirgeler

dizge

Başlık dizgesi.

İki özel çağrı biçimi vardır. İlki, HTTP durum kodu gönderilirken kullanılır ve başlık "HTTP/" dizgesi ile başlar (harf büyüklüğüne duyarsız). Örneğin Apache'yi eksik dosyalarla ilgili sorunlar için (ErrorDocument yönergesi ile) bir PHP betiğini kullanacak şekilde yapılandırmışsanız betiğinizde uygun bir durum kodu üretmek için bu biçimi kullanabilirsiniz.

<?php
header
("HTTP/1.0 404 Not Found");
?>

İkinci özel biçim "Location:" başlığıdır. Bu başlığın tarayıcıya geri gönderilmesinden başka, bir 201 veya 3xx durum kodu henüz atanmamışsa ayrıca bir REDIRECT (302) durum kodu da gönderilir.

<?php
header
("Location: http://mesela.dom/"); /* Tarayıcıyı yönlendir */

/* Yönlendirme sonrası herhangi bir kodun çalıştırılmamasını sağlayalım. */
exit;
?>

değiştir

değiştir değiştirgesi isteğe bağlı olup, önceki bir başlığın mı değiştireceğini yoksa aynı türde ikinci bir başlık daha mı ekleneceğini belirtilir. Öntanımlı davranış mevcudu değiştirmektir. İşleve ikinci değiştirge olarak FALSE aktarırsanız aynı türde çok sayıda başlık bulunması için işlevi zorlamış olursunuz. Örnek:

<?php
header
('WWW-Authenticate: Negotiate');
header('WWW-Authenticate: NTLM'false);
?>

http_yanıt_kodu

HTTP yanıt kodunun belirtilen değer olması için zorlanır.

Dönen Değerler

Hiçbir değer dönmez.

Sürüm Bilgisi

Sürüm: Açıklama
4.4.2 ve 5.1.2 Başlık yerleştirme saldırılarına karşı bir önlem olarak bu işlev artık bir kerede birden fazla başlık gönderilmesine izin vermemektedir.
4.3.0 http_yanıt_kodu değiştirgesi eklendi.
4.0.4 değiştir değiştirgesi eklendi.

Örnekler

Örnek 1 - İndirme söyleşisi

Kulanıcıyı, gönderdiğiniz veriyi (örneğin, bir PDF dosyası) kaydetmesi için uyarmak isterseniz, bir dosya ismi belirtmek ve tarayıcının bir dosya kayıt söyleşisi göstermesini sağlamak için » Content-Disposition başlığını kullanabilirsiniz.

<?php
// Bir PDF çıktılayacağız
header('Content-type: application/pdf');

// Dosya ismi indirilen.pdf olsun
header('Content-Disposition: attachment; filename="indirilen.pdf"');

// Okunacak PDF dosyası
readfile('original.pdf');
?>

Örnek 2 - Yönergelerin önbelleklenmesi

PHP betikleri çoğunlukla istemcinin tarayıcısı veya sunucuya aracılık eden vekiller tarafından önbelleğe alınmaması gereken devingen içerikler üretirler. Çoğu vekilin veya tarayıcının önbellekleme işlemini kapatmasını şöyle sağlayabilirsiniz:

<?php
header
("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Geçmişte bir tarih
?>

Bilginize:

Yukarıdaki başlıkların hiçbirini çıktılamadığınız halde sayfalarınız önbelleğe alınmıyor olabilir. Kullanıcının kendi tarayıcısının önbellekleme ile ilgili öntanımlı davranışını değiştirebileceği çok çeşitli seçenekleri olabilir. Yukarıdaki başlıkları göndererek bu tür olası ayarları geçersiz kılabilirsiniz.

Ayrıca, oturumları kullanırken önbellekleme ile ilgili doğru başlıkların özdevinimli olarak üretilmesi için session_cache_limiter() işlevini ve session.cache_limiter yapılandırma yönergesini kullanabilirsiniz.

Notlar

Bilginize:

PHP 4'ten itibaren, bu işlevi çağırmadan önce, tarayıcıya gönderilene kadar sunucuda bekletilmek üzere çıktıyı bir tampona yazabilirsiniz. Bu işlemi betiğinizden ob_start() ve ob_end_flush() işlevlerini çağırarak veya output_buffering yapılandırma yönergesini php.ini veya sunucu yapılandırma dosyalarında belirterek yapabilirsiniz.

Bilginize:

header() çağrısının ilk çağrı olup olmamasından bağımsız olarak istemciye ilk olarak daima HTTP durum başlığı satırı gönderilir. header() işlevini hiçbir HTTP başlığı gönderilmeden önce yeni bir durum satırı ile kullanırsanız bu durum satırını geçersiz kılabilirsiniz.

Bilginize:

Microsoft Internet Explorer 4.01'de bunun çalışmasını engelleyen bir hata vardır ve bundan kurtulmanın çaresi yoktur. Ayrıca, Microsoft Internet Explorer 5.5'te de böyle bir hata vardır. Fakat SP2'ye yükselterek bu sorundan kurtulmak mümkündür.

Bilginize: Eğer safe mode etkinse ve HTTP kimlik doğrulaması için WWW-Authenticate başlığını kullanıyorsanız başlığın realm alanına betiğin kullanıcı kimliği eklenecektir.

Bilginize:

HTTP/1.1, » Location: için değiştirge olarak bir mutlak URI belirtilmesini gerektirir (şema, konak ismi ve mutlak dosya yolu dahil), fakat bazı istemciler göreli URI'leri kabul ederler. Bir mutlak URI'yi bir göreli URI'ye dönüştürmek için örnekteki gibi $_SERVER['HTTP_HOST'], $_SERVER['PHP_SELF'] ve dirname() kullanabilirsiniz:

<?php
/* Bulunulan dizinde başka bir sayfaya yönlendirelim */
$konak  $_SERVER['HTTP_HOST'];
$yol   rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
$ek 'sayfam.php';
header("Location: http://$konak$yol/$ek");
exit;
?>

Bilginize:

Oturum kimliği, session.use_trans_sid etkin olsa bile Location başlığı ile aktarılmaz. SID sabiti kullanılarak elle aktarılmalıdır.

Ayrıca Bakınız

add a note add a note

User Contributed Notes 22 notes

up
31
mjt at jpeto dot net
4 years ago
I strongly recommend, that you use

header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");

instead of

header("HTTP/1.1 404 Not Found");

I had big troubles with an Apache/2.0.59 (Unix) answering in HTTP/1.0 while I (accidentially) added a "HTTP/1.1 200 Ok" - Header.

Most of the pages were displayed correct, but on some of them apache added weird content to it:

A 4-digits HexCode on top of the page (before any output of my php script), seems to be some kind of checksum, because it changes from page to page and browser to browser. (same code for same page and browser)

"0" at the bottom of the page (after the complete output of my php script)

It took me quite a while to find out about the wrong protocol in the HTTP-header.
up
11
bMindful at fleetingiamge dot org
10 years ago
If you haven't used, HTTP Response 204 can be very convenient. 204 tells the server to immediately termiante this request. This is helpful if you want a javascript (or similar) client-side function to execute a server-side function without refreshing or changing the current webpage. Great for updating database, setting global variables, etc.

     header("status: 204");  (or the other call)
     header("HTTP/1.0 204 No Response");
up
8
Dylan at WeDefy dot com
6 years ago
A quick way to make redirects permanent or temporary is to make use of the $http_response_code parameter in header().

<?php
// 301 Moved Permanently
header("Location: /foo.php",TRUE,301);

// 302 Found
header("Location: /foo.php",TRUE,302);
header("Location: /foo.php");

// 303 See Other
header("Location: /foo.php",TRUE,303);

// 307 Temporary Redirect
header("Location: /foo.php",TRUE,307);
?>

The HTTP status code changes the way browsers and robots handle redirects, so if you are using header(Location:) it's a good idea to set the status code at the same time.  Browsers typically re-request a 307 page every time, cache a 302 page for the session, and cache a 301 page for longer, or even indefinitely.  Search engines typically transfer "page rank" to the new location for 301 redirects, but not for 302, 303 or 307. If the status code is not specified, header('Location:') defaults to 302.
up
7
mandor at mandor dot net
8 years ago
When using PHP to output an image, it won't be cached by the client so if you don't want them to download the image each time they reload the page, you will need to emulate part of the HTTP protocol.

Here's how:

<?php

   
// Test image.
   
$fn = '/test/foo.png';

   
// Getting headers sent by the client.
   
$headers = apache_request_headers();

   
// Checking if the client is validating his cache and if it is current.
   
if (isset($headers['If-Modified-Since']) && (strtotime($headers['If-Modified-Since']) == filemtime($fn))) {
       
// Client's cache IS current, so we just respond '304 Not Modified'.
       
header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($fn)).' GMT', true, 304);
    } else {
       
// Image not cached or cache outdated, we respond '200 OK' and output the image.
       
header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($fn)).' GMT', true, 200);
       
header('Content-Length: '.filesize($fn));
       
header('Content-Type: image/png');
        print
file_get_contents($fn);
    }

?>

That way foo.png will be properly cached by the client and you'll save bandwith. :)
up
4
ben at indietorrent dot org
1 year ago
Be aware that sending binary files to the user-agent (browser) over an encrypted connection (SSL/TLS) will fail in IE (Internet Explorer) versions 5, 6, 7, and 8 if any of the following headers is included:

Cache-control:no-store
Cache-control:no-cache

See: http://support.microsoft.com/kb/323308

Workaround: do not send those headers.

Also, be aware that IE versions 5, 6, 7, and 8 double-compress already-compressed files and do not reverse the process correctly, so ZIP files and similar are corrupted on download.

Workaround: disable compression (beyond text/html) for these particular versions of IE, e.g., using Apache's "BrowserMatch" directive. The following example disables compression in all versions of IE:

BrowserMatch ".*MSIE.*" gzip-only-text/html
up
11
mzheng[no-spam-thx] at ariba dot com
5 years ago
For large files (100+ MBs), I found that it is essential to flush the file content ASAP, otherwise the download dialog doesn't show until a long time or never.

<?php
header
("Content-Disposition: attachment; filename=" . urlencode($file));   
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Description: File Transfer");            
header("Content-Length: " . filesize($file));
flush(); // this doesn't really matter.

$fp = fopen($file, "r");
while (!
feof($fp))
{
    echo
fread($fp, 65536);
   
flush(); // this is essential for large downloads

fclose($fp);
?>
up
4
scott at lucentminds dot com
4 years ago
If you want to remove a header and keep it from being sent as part of the header response, just provide nothing as the header value after the header name. For example...

PHP, by default, always returns the following header:

"Content-Type: text/html"

Which your entire header response will look like

HTTP/1.1 200 OK
Server: Apache/2.2.11 (Unix)
X-Powered-By: PHP/5.2.8
Date: Fri, 16 Oct 2009 23:05:07 GMT
Content-Type: text/html; charset=UTF-8
Connection: close

If you call the header name with no value like so...

<?php

    header
( 'Content-Type:' );

?>

Your headers now look like this:

HTTP/1.1 200 OK
Server: Apache/2.2.11 (Unix)
X-Powered-By: PHP/5.2.8
Date: Fri, 16 Oct 2009 23:05:07 GMT
Connection: close
up
4
shutout2730 at yahoo dot com
5 years ago
It is important to note that headers are actually sent when the first byte is output to the browser. If you are replacing headers in your scripts, this means that the placement of echo/print statements and output buffers may actually impact which headers are sent. In the case of redirects, if you forget to terminate your script after sending the header, adding a buffer or sending a character may change which page your users are sent to.

This redirects to 2.html since the second header replaces the first.

<?php
header
("location: 1.html");
header("location: 2.html"); //replaces 1.html
?>

This redirects to 1.html since the header is sent as soon as the echo happens. You also won't see any "headers already sent" errors because the browser follows the redirect before it can display the error.

<?php
header
("location: 1.html");
echo
"send data";
header("location: 2.html"); //1.html already sent
?>

Wrapping the previous example in an output buffer actually changes the behavior of the script! This is because headers aren't sent until the output buffer is flushed.

<?php
ob_start
();
header("location: 1.html");
echo
"send data";
header("location: 2.html"); //replaces 1.html
ob_end_flush(); //now the headers are sent
?>
up
2
nobileelpirata at hotmail dot com
6 years ago
This is the Headers to force a browser to use fresh content (no caching) in HTTP/1.0 and HTTP/1.1:

<?PHP
header
( 'Expires: Sat, 26 Jul 1997 05:00:00 GMT' );
header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
header( 'Cache-Control: no-store, no-cache, must-revalidate' );
header( 'Cache-Control: post-check=0, pre-check=0', false );
header( 'Pragma: no-cache' );

?>
up
1
Refugnic
4 years ago
My files are in a compressed state (bz2). When the user clicks the link, I want them to get the uncompressed version of the file.

After decompressing the file, I ran into the problem, that the download dialog would always pop up, even when I told the dialog to 'Always perform this operation with this file type'.

As I found out, the problem was in the header directive 'Content-Disposition', namely the 'attachment' directive.

If you want your browser to simulate a plain link to a file, either change 'attachment' to 'inline' or omit it alltogether and you'll be fine.

This took me a while to figure out and I hope it will help someone else out there, who runs into the same problem.
up
2
bebertjean at yahoo dot fr
5 years ago
If using the 'header' function for the downloading of files, especially if you're passing the filename as a variable, remember to surround the filename with double quotes, otherwise you'll have problems in Firefox as soon as there's a space in the filename.

So instead of typing:

<?php
  header
("Content-Disposition: attachment; filename=" . basename($filename));
?>

you should type:

<?php
  header
("Content-Disposition: attachment; filename=\"" . basename($filename) . "\"");
?>

If you don't do this then when the user clicks on the link for a file named "Example file with spaces.txt", then Firefox's Save As dialog box will give it the name "Example", and it will have no extension.

See the page called "Filenames_with_spaces_are_truncated_upon_download" at
http://kb.mozillazine.org/ for more information. (Sorry, the site won't let me post such a long link...)
up
0
Cody G.
3 years ago
After lots of research and testing, I'd like to share my findings about my problems with Internet Explorer and file downloads.

  Take a look at this code, which replicates the normal download of a Javascript:

<?php
 
if(strstr($_SERVER["HTTP_USER_AGENT"],"MSIE")==false) {
 
header("Content-type: text/javascript");
 
header("Content-Disposition: inline; filename=\"download.js\"");
 
header("Content-Length: ".filesize("my-file.js"));
 } else {
 
header("Content-type: application/force-download");
 
header("Content-Disposition: attachment; filename=\"download.js\"");
 
header("Content-Length: ".filesize("my-file.js"));
 }
 
header("Expires: Fri, 01 Jan 2010 05:00:00 GMT");
 if(
strstr($_SERVER["HTTP_USER_AGENT"],"MSIE")==false) {
 
header("Cache-Control: no-cache");
 
header("Pragma: no-cache");
 }
 include(
"my-file.js");
?>

Now let me explain:

  I start out by checking for IE, then if not IE, I set Content-type (case-sensitive) to JS and set Content-Disposition (every header is case-sensitive from now on) to inline, because most browsers outside of IE like to display JS inline. (User may change settings). The Content-Length header is required by some browsers to activate download box. Then, if it is IE, the "application/force-download" Content-type is sometimes required to show the download box. Use this if you don't want your PDF to display in the browser (in IE). I use it here to make sure the box opens. Anyway, I set the Content-Disposition to attachment because I already know that the box will appear. Then I have the Content-Length again.

  Now, here's my big point. I have the Cache-Control and Pragma headers sent only if not IE. THESE HEADERS WILL PREVENT DOWNLOAD ON IE!!! Only use the Expires header, after all, it will require the file to be downloaded again the next time. This is not a bug! IE stores downloads in the Temporary Internet Files folder until the download is complete. I know this because once I downloaded a huge file to My Documents, but the Download Dialog box put it in the Temp folder and moved it at the end. Just think about it. If IE requires the file to be downloaded to the Temp folder, setting the Cache-Control and Pragma headers will cause an error!

I hope this saves someone some time!
~Cody G.
up
0
Marcel G
4 years ago
Several times this one is asked on the net but an answer could not be found in the docs on php.net ...

If you want to redirect an user and tell him he will be redirected, e. g. "You will be redirected in about 5 secs. If not, click here." you cannot use header( 'Location: ...' ) as you can't sent any output before the headers are sent.

So, either you have to use the HTML meta refresh thingy or you use the following:

<?php
  header
( "refresh:5;url=wherever.php" );
  echo
'You\'ll be redirected in about 5 secs. If not, click <a href="wherever.php">here</a>.';
?>

Hth someone
up
0
Anonymous
4 years ago
I just want to add, becuase I see here lots of wrong formated headers.

1. All used headers have first letters uppercase, so you MUST follow this. For example:

Location, not location
Content-Type, not content-type, nor CONTENT-TYPE

2. Then there MUST be colon and space, like

good: header("Content-Type: text/plain");
wrong: header("Content-Type:text/plain");

3. Location header MUST be absolute uri with scheme, domain, port, path, etc.

good: header("Location: http://www.example.com/something.php?a=1");

4. Relative URIs are NOT allowed

wrong:  Location: /something.php?a=1
wrong:  Location: ?a=1

It will make proxy server and http clients happier.
up
0
sk89q
5 years ago
You can use HTTP's etags and last modified dates to ensure that you're not sending the browser data it already has cached.

<?php
$last_modified_time
= filemtime($file);
$etag = md5_file($file);

header("Last-Modified: ".gmdate("D, d M Y H:i:s", $last_modified_time)." GMT");
header("Etag: $etag");

if (@
strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $last_modified_time ||
   
trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag) {
   
header("HTTP/1.1 304 Not Modified");
    exit;
}
?>
up
0
Kal
6 years ago
I spent a long time trying to determine why Internet Explorer 7 wasn't prompting the user to save a download based on the filename specified on a "'Content-Disposition: attachment; filename=..." header line.

I eventually determined that my Apache installation was adding an additional header: "Vary: Host", which was throwing IE - as per http://support.microsoft.com/kb/824847

I found manually setting the Vary header from within PHP as follows header('Vary: User-Agent'); allowed IE to behave as intended.

Hope this saves someone else some time,

- Kal
up
1
jp at webgraphe dot com
10 years ago
A call to session_write_close() before the statement

<?php
    header
("Location: URL");
    exit();
?>

is recommended if you want to be sure the session is updated before proceeding to the redirection.

We encountered a situation where the script accessed by the redirection wasn't loading the session correctly because the precedent script hadn't the time to update it (we used a database handler).

JP.
up
-1
this dot person at joaocunha dot eti dot br
4 years ago
AVOID ZERO BYTE ORDER MARK!

Header MUST be sent before EVERYTHING in the page. Even a single space will break your script. In my case, there was BOM setted in the encoding, so I opened the file with notepad++ and set the encoding to UTF-8 (no BOM) and voila, everything is working great now.
up
-1
dev at omikrosys dot com
4 years ago
Just to inform you all, do not get confused between Content-Transfer-Encoding and Content-Encoding

Content-Transfer-Encoding specifies the encoding used to transfer the data within the HTTP protocol, like raw binary or base64. (binary is more compact than base64. base64 having 33% overhead).
Eg Use:- header('Content-Transfer-Encoding: binary');

Content-Encoding is used to apply things like gzip compression to the content/data.
Eg Use:- header('Content-Encoding: gzip');
up
-1
Jamesb
5 years ago
Here is a php script I wrote to stream a file and crypt it with a xor operation on the bytes and with a key :

The encryption works very good but the speed is decrease by 2, it is now 520KiB/s. The user is now asked for a md5 password (instead of keeping it in the code directly). There is some part in French because it's my native language so modify it as you want.

<?php
// Stream files and encrypt the data on-the-fly

// Settings
// -- File to stream
$file = "FILE_out";
// -- Reading buffer
$bufferlength = 3840;
// -- Key in hex
//$keychar = "9cdfb439c7876e703e307864c9167a15";

// Function: Convertion hex key in a string into binary
function hex2bin($h) {
    if (!
is_string($h)) return null;
   
$r = array();
    for (
$a=0; ($a*2)<strlen($h); $a++) {
       
$ta = hexdec($h[2*$a]);
       
$tb = hexdec($h[(2*$a+1)]);
       
$r[$a] = (int) (($ta << 4) + $tb);
    }
    return
$r;
}

// Function to send the auth headers
function askPassword($text="Enter the password") {
   
header('WWW-Authenticate: Basic realm="'. utf8_decode($text) .'"');
   
header('HTTP/1.0 401 Unauthorized');
    return
1;
}

// Key is asked at the first start
if (!isset($_SERVER['PHP_AUTH_PW'])) {
   
askPassword();
    echo
"Une clé est nécessaire !<br />";
    exit;
}
// Get the key in hex
$keychar = $_SERVER['PHP_AUTH_PW'];

// Convert key and set the size of the key
$key = hex2bin($keychar);
$keylength = count($key);
// Teste si la clé est valide en hex
if ($key == "" || $keylength <= 4) {
   
askPassword("Clé incorrecte !");
   
//echo "Clé incorrecte !<br />";
   
exit();
}
// Teste si la clé est de longueur d'une puissance de 2
if ( ($keylength%2) != 0) {
   
askPassword("Clé de longueur incorrecte (multiple de 2 uniquement)");
   
//echo "Clé de longueur incorrecte (puissance de 2 uniquement)<br />";
   
exit();
}

// Headers
header("Content-Type: application/octet-stream; ");
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . filesize($file) ."; ");
header("filename=\"".$file."\"; ");
flush(); // this doesn't really matter.

// Opening the file in read-only
$fp = fopen($file, "r");
while (!
feof($fp))
{
   
// Read a buffer size of the file
   
$buffer = fread($fp, $bufferlength);
   
$j=0;
    for (
$i=0; $i < $bufferlength; $i++) {
       
// The key is read in loop to crypt the whole file
       
if ($i%$keylength == 0) {
           
$j=0;
        }
       
// Apply a xor operation between the key and the file to crypt
        // This operation eats a lots of CPU time (Stream at 1MiB/s on my server; Intel E2180)
       
$tmp = pack("C", $key[$j]);
       
$bufferE = ( $buffer[$i]^$tmp); // <==== Le fameux XOR
       
        /*
        echo "<br />key[".$j."]: ";
        var_dump($tmp);
        echo "<br />buffer[".$i."]: ";
        var_dump($buffer[$i]);
        echo "<br />bufferE: ";
        var_dump($bufferE);
        echo "<br />";
        //*/
       
        // Send the encrypted data
       
echo $bufferE;
       
// Clean the memory
       
$bufferE = "";
       
$j++;
    }
   
$buffer = "";
   
flush(); // this is essential for large downloads
    /*
    fclose($fp);
    exit();
    //*/
}
// Close the file and it's finished
fclose($fp);

?>
up
-2
cedric at gn dot apc dot org
3 years ago
Setting a Location header "returns a REDIRECT (302) status code to the browser unless the 201 or a 3xx status code has already been set".  If you are sending a response to a POST request, you might want to look at RFC 2616 sections 10.3.3 and 10.3.4.   It is suggested that if you want the browser to immediately GET the resource in the Location header in this circumstance, you should use a 303 status code not the 302 (with the same link as hypertext in the body for very old browsers).  This may have (rare) consequences as mentioned in bug 42969.
up
-2
jamie
5 years ago
The encoding of a file is discovered by the Content-Type, either in the HTML meta tag or as part of the HTTP header. Thus, the server and browser does not need - nor expect - a Unicode file to begin with a BOM mark. BOMs can confuse *nix systems too. More info at http://unicode.org/faq/utf_bom.html#bom1

On another note: Safari can display CMYK images (at least the OS X version, because it uses the services of QuickTime)
To Top