Gzip compression is a good way to compress and transfer pages. We often open it on the server, so that a kb file may be less than 20 KB after being compressed by gzip, next I will introduce the gzip compression detection and enabling methods.
What if gzip compression is enabled?
Apache
Step 2
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LoadModule deflate_module modules/mod_deflate.so
LoadModule headers_module modules/mod_headers.so |
Add the following code in http. conf:
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# BEGIN GZIP
# Before enabling gzip compression for apache, install the gzip module.
<Ifmodule mod_deflate.c>
AddOutputFilterByType DEFLATE text/html
Text/plain text/xml text/css application/x-javascript
Application/javascript
</Ifmodule>
# END GZIP |
If you are an nginx server, refer to the following code:
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# Enable gzip compression in nginx and put it in location
Gzip on;
Gzip_min_length 1000;
Gzip_buffers 4 8 k;
Gzip_http_version 1.1;
Gzip_types text/html text/plain text/xml
Text/css application/x-javascript application/javascript; |
Restart apache or nginx. How can I check whether gzip is enabled correctly? The following php code can be used.
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// Mill military network uses gzip to compress webpages
// The webpage directly obtained by file_get_contents is garbled.
Header ('content-Type: text/html; charset = UTF-8 ');
$ Url = 'HTTP: // www. bKjia. c0m ';
$ File = fopen ($ url, "rb ");
// Read-only 2 bytes. If the value is (in hexadecimal format) 1f 8b (in hexadecimal format) 31 139, gzip is enabled;
$ Bin = fread ($ file, 2 );
Fclose ($ file );
$ StrInfo = @ unpack ("C2chars", $ bin );
$ TypeCode = intval ($ strInfo ['chars1']. $ strInfo ['chars2']);
$ IsGzip = 0;
Switch ($ typeCode)
{
Case 31139:
// The website has enabled gzip.
$ IsGzip = 1;
Break;
Default:
$ IsGzip = 0;
}
$ Url = $ isGzip? "Compress. zlib: //". $ url: $ url; // ternary expression
$ MierHtml = file_get_contents ($ url); // obtain mill Military Network Data
$ MierHtml = iconv ("gbk", "UTF-8", $ mierHtml );
Echo $ mierHtml; |
Example 2
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<? Php
/*
Php determines whether the url page is compressed using gzip
*/
$ Ch = curl_init ("http://www.hzhuti.com/"); // url cannot have redirection
Curl_setopt ($ ch, CURLOPT_HTTPHEADER, array ('Accept-Encoding: gzip, deflate '));
Curl_setopt ($ ch, CURLOPT_HEADER, 1 );
Curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1 );
$ Buffer = curl_exec ($ ch );
$ Curl_info = curl_getinfo ($ ch );
Curl_close ($ ch );
$ Header_size = $ curl_info ["header_size"];
// Header Length
$ Headers = substr ($ buffer, 0, $ header_size );
// Obtain the header information
$ Body = substr ($ buffer, $ header_size );
// Obtain the webpage content
Function getEncoding (& $ headers ){
$ Arr = explode ("rn", trim ($ headers ));
Array_shift ($ arr );
Foreach ($ arr as $ header ){
List ($ k, $ v) = explode (':', $ header );
If ('content-encoding' = strtolower ($ k )){
Return trim ($ v );
}
}
Return false;
}
$ Encoding = getEncoding ($ headers );
If ($ encoding ){
Echo "Using:". $ encoding;
} Else {
Echo "None ";
}
?>
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