> Edraw Tip > Large File Http Post Upload - PHP and ASP.net
To upload large files to web server, the developers need to modify some settings in the php or asp.net program.
By default, PHP permits a maximum file upload of 2MB. So
it's necessary to increase the limit when necessary.
Two PHP configuration options control the maximum upload size:
upload_max_filesize and post_max_size. Both can be set to, say, "20M" for 20
megabyte file sizes.
However, you also need to consider the time it takes to
complete an uploading. PHP scripts normally time-out after 30 seconds, but a 20MB
file would take at least 5 minutes to upload on a healthy broadband connection.
In addition, manipulating or saving an uploaded office file may also cause
script time-outs. We therefore need to set PHP's max_input_time and
max_execution_time to something like 300 (5 minutes specified in seconds).
These options can be set in your server's php.ini configuration file so that
they apply to all your applications. Alternatively, if you're using Apache, you
can configure the settings in your application's .htaccess file:
php_value upload_max_filesize 20M
php_value post_max_size 20M
php_value max_input_time 300
php_value max_execution_time 300
Finally, you can define the constraints within your PHP
application:
ini_set('upload_max_filesize', '20M');
ini_set('post_max_size', '20M');
ini_set('max_input_time', 300);
ini_set('max_execution_time', 300);
Setting the options in your PHP code is possibly more
practical, since you can extend the execution time and increase the file size
when your application is expecting a large uploading.
For asp.net program, you need config the web.config.
The following attributes can be assigned to the <httpRuntime>
tag in the <system.web> section of the Web.config file.
1. maxRequestLength : Specifies the limit for the input
stream buffering threshold, in KB. This limit can be used to prevent denial of
service attacks that are caused, for example, by users posting large files to
the server. The default value is 4096 (4 MB). To enable large file uploads you
need to change the value of this attribute to the largest allowed combined file
size for your application. If someone selects and uploads files with total size
larger than maxRequestLength, this will result in a "Page not found" error
(which is the default error of the Framework).
2. executionTimeout : Specifies the maximum number of
seconds that a request is allowed to execute before being automatically shut
down by ASP.NET. The value of this setting is ignored in debug mode. The default
in .NET Framework 2.0 is 110 seconds. In the .NET Framework 1.0 and 1.1, the
default is 90 seconds.
To enable large file uploading, which can take long periods
of time, increase the value of this property (executionTimeout).
For example: The configuration, allowing uploading of files
up to 100MB and uploading periods up to 1 hour, should looks like the followings:
<?xml version="1.0"?>
<configuration>
<appSettings/>
<connectionStrings/>
<system.web>
<httpRuntime maxRequestLength="102400" executionTimeout="3600" />
<compilation debug="true" targetFramework="4.0"/>
<authentication mode="Windows"/>
<pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"/>
</system.web>
<system.webServer>
<security >
<requestFiltering>
<requestLimits maxAllowedContentLength="1024000000" />
</requestFiltering>
</security>
</system.webServer>
</configuration>
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