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Editor to share with you nginx+php-fpm how to achieve large file download, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

For example:

Set_time_limit (0); / / omit the process of fetching the file path, which is directly the full file path $filePath = get_save_path (). $File ['save_name']; $filePath = realpath ($filePath); $outFileExtension = strtolower (strrchr ($filePath, ".", 1)); / / get the file extension / / indicate the output browser format switch ($outFileExtension) {case "exe": $ctype = "application/octet-stream"; break; case "zip": $ctype = "application/zip"; break; case "mp3": $ctype = "audio/mpeg" Break; case "mpg": $ctype = "video/mpeg"; break; case "avi": $ctype = "video/x-msvideo"; break; default: $ctype = "application/force-download";} header ("Cache-Control:"); header ("Cache-Control: public"); / / set the output browser format header ("Content-Type: $ctype"); header ("Content-Disposition: attachment; filename=". Basename ($filePath); header ("Accept-Ranges: bytes"); $size = filesize ($filePath); / / if there is a $_ SERVER ['HTTP_RANGE'] parameter if (isset ($_ SERVER [' HTTP_RANGE'])) {/ * Range header domain Range header domain can request one or more subranges of the entity. For example, bytes=0-499 represents the second 500byte: bytes=500- 999 represents the last 500byte: bytes=-500 represents the range after 500byte: bytes=500- first and last byte: bytes=0-0mai 1 specifies several ranges at the same time: bytes=500- 600601-999 but the server can ignore this request header if the unconditional GET contains the Range request header The response is returned with a status code of206 (PartialContent) instead of of200 (OK). * / / connect the value bytes=4390912- list ($a, $range) of $_ SERVER ['HTTP_RANGE'] again after the breakpoint = explode ("=", $_ SERVER [' HTTP_RANGE']); / / if yes, download missing part str_replace ($range, "-", $range); / / what does this sentence do. $size2 = $size-1; / / Total file bytes $new_length = $size2-$range; / / get the length of the next download header ("HTTP/1.1 206length"); header ("Content-Length: $new_length"); / / enter the total length header ("Content-Range: bytes $range$size2/$size"); / / Content-Range: bytes 4908618-4988927,498892895%} else {/ / first connection $size2 = $size-1 Header ("Content-Range: bytes 0-$size2/$size"); / / Content-Range: bytes 0-4988927 header ("Content-Length:". $size); / / output total length} / / Open the file $fp = fopen ("$filePath", "rb"); / / set the pointer position if (! empty ($range)) {fseek ($fp, $range);} / / Unreal output while (! feof ($fp)) {print ($fp, 1024 * 8)); / / output file flush (); / / output buffer ob_flush ();} fclose ($fp); exit ()

The code is explained in detail and clear, but in actual use, small files can be downloaded, large files can only be downloaded in the first half, or the file has been corrupted. Check the nginx log and find the following error

2018-08-01 07:43:20 [crit] 13906'0: * 1479 open () "/ usr/local/nginx/fastcgi_temp/0/02/0000000020" failed (13: Permission denied) while reading upstream

It turns out that when downloading a large file, when the file size exceeds the configured proxy_temp_file_write_ size value, nginx will write the file to a temporary directory. If the directory does not have permission, it cannot be written, so the download can only download the contents of the cache area.

Verify that the permission grouping of the / usr/local/nginx/fastcgi_temp/ directory is not under the nginx running account group. Now that you know the cause of the problem, it is easy to do so. Give write permission, or change the directory to nginx running account group to OK.

Cd / usr/local/nginx/ chmod-R 766 fastcgi_temp/ or chown-R nginx:nginx fastcgi_temp/ # nginx may not be able to account according to their respective situations. these are all the contents of the article "how to download large files in nginx+php-fpm". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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