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2. Command: "php HttpRequestGet.php /dot.gif" gives us:
HTTP/1.1 200 OK
Server: Microsoft-IIS/5.1
Date: Sun, 13 Nov 2005 04:40:17 GMT
Content-Type: image/gif
Accept-Ranges: bytes
Last-Modified: Sun, 11 Aug 2002 20:48:20 GMT
ETag: "04237ecd343c21:c61"
Content-Length: 43
GIF89a......
As you can see, Content-Type was set correctly to "image/gif" for file name extension
"gif", as defined in the MIME settings. I could not include the entity body here because it contains binary data.
3. Command: "php HttpRequestGet.php /hello.pdf" gives us:
HTTP/1.1 200 OK
Server: Microsoft-IIS/5.1
Date: Sun, 13 Nov 2005 04:45:03 GMT
Content-Type: application/pdf
Accept-Ranges: bytes
Last-Modified: Sun, 27 Jul 2003 20:22:12 GMT
ETag: "0b2f4c27c54c31:c61"
Content-Length: 909
%PDF-1.3
% ...
4 0 obj
......
Again, Content-Type was set correctly to "application/pdf" for file name extension
"pdf", as defined in the MIME settings. I truncated the entity body to save some space.
Controlling Header Lines - Example Scripts
Now let's see how the PHP engine defines header lines and how you can control them.
First create this simple script, hello.php, and copy it to c:\inetpub\wwwroot.
Hello <?php echo "world!"; ?>
Then obtain the response with "php HttpRequestGet.php /hello.php":
HTTP/1.1 200 OK
Server: Microsoft-IIS/5.1
Date: Sat, 19 Nov 2005 02:39:52 GMT
Content-type: text/html
X-Powered-By: PHP/5.0.4
Hello world!
Comparing with the static files, the output shows:
- PHP engine added its own header line, "X-Powered-By".
- IIS still keeps the header line, "Server".
- No more "ETag". Anyway, I don't know what is ETag.
- PHP defaulted "Content-Type" to "text/html".
- "Content-Length" is not provided. This is not a good thing, if the client relies on this value.
Now, I am ready to instruct the PHP how to define header lines. Here is my testing
script, HttpHeaderLines.php:
<?php #HttpHeaderLines.php
# Copyright (c) 2005 by Dr. Herong Yang, http://www.herongyang.com/
#
$text = "<html><body>Hello world!</body></html>";
print($text);
header("Content-Type: text/xml;charset=utf-8");
header("Content-Length: ".strlen($text));
header("Version: Unknown");
header("Version: 2005");
header("Key-Word: PHP");
header("Key-Word: HTTP", false);
?>
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