Laravel Headers and Caching in php -


i have small image generator part of laravel4 application. takes 700ms generate image , have started caching generated result on server , returning browser instead saves time.

as image never change once generated wanted tell browser cache image locally , have done following code:

$path = $cachefolderpath . $cachefilename;  if (file::exists( $path )){     $response = response::make(file::get($path));     $response->header('content-type', 'image/png');     $response->header('content-disposition', 'inline; filename="'.$cachefilename.'"');     $response->header('content-transfer-encoding', 'binary');     $response->header('cache-control', 'public, max-age=10800, pre-check=10800');     $response->header('pragma', 'public');     $response->header('expires', date(date_rfc822,strtotime(" 2 day")) );     $response->header('last-modified', date(date_rfc822, file::lastmodified($path)) );     $response->header('content-length', filesize($path));     return $response; }

this sends image status code 200 ok browser following headers:

cache-control:max-age=10800, pre-check=10800, public connection:keep-alive content-disposition:inline; filename="pie_0_normal.png" content-length:2129 content-transfer-encoding:binary content-type:image/png date:wed, 07 aug 2013 10:29:20 gmt expires:fri, 09 aug 13 10:29:20 +0000 keep-alive:timeout=5, max=93 last-modified:wed, 07 aug 13 10:14:42 +0000 pragma:public server:apache/2.4.3 (win32) openssl/1.0.1c php/5.4.7 set-cookie:laravel_session=767487mhf6j2btv3k01vu56174; expires=wed, 07-aug-2013 12:29:20 gmt; path=/; httponly x-powered-by:php/5.4.7

my issue browser (chrome, not tested in others) still refuses grab local cached version , instead hits server again.

i have spent half hour searching other questions on subject , of them have given me answers have incorporated above code. while know there similar questions, 1 unique above source code.

my question is, doing wrong result in file not being cached browser?

an alternative method check 'if-modified-since' request header present if browser has file.

if present, know file created , can respond link it, otherwise run code above. this...

// check if client validating cache , if current if ( isset( $headers['if-modified-since'] ) && ( strtotime( $headers['if-modified-since'] ) == filemtime( $image->get_full_path() ) ) ) {      // cache current, respond 304     header( 'last-modified: ' . $image->get_last_modified(), true, 304 );  } else {      // not cached or client cache older server, respond 200 , output      header( 'last-modified: ' . $image->get_last_modified(), true, 200 );     header( 'content-length: ' . $image->get_filesize() );     header( 'cache-control: max-age=' . $image->get_expires() );     header( 'expires: '. gmdate('d, d m y h:i:s \g\m\t', time() + $image->get_expires() ) );     header( 'content-type: image/jpeg');      print file_get_contents( $image->get_full_path() );  }

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