ngx_http_concat_module

The module is inspired by Apache's modconcat. It follows the same pattern for enabling the concatenation. It uses two ?, like this:

http://example.com/??style1.css,style2.css,foo/style3.css

If a third ? is present it's treated as version string. Like this:

http://example.com/??style1.css,style2.css,foo/style3.css?v=102234

Examples

location /static/css/ {
    concat on;
    concat_max_files 20;
}

location /static/js/ {
    concat on;
    concat_max_files 30;
}

Directives

concat on | off default: concat off context: http, server, location

It enables the concatenation in a given context.

concat_types MIME types default: concat_types: text/css application/x-javascript context: http, server, location

Defines the MIME types which can be concatenated in a given context.

concat_unique on | off default: concat_unique on context: http, server, location

Defines if only files of a given MIME type can concatenated or if several MIME types can be concatenated. For example if set to off then in a given context you can concatenate Javascript and CSS files.

Note that the default value is on, meaning that only files with same MIME type are concatenated in a given context. So if you have CSS and JS you cannot do something like this:

http://example.com/static/??foo.css,bar/foobaz.js

In order to do that you must set concat_unique off. This applies to any other type of files that you decide to concatenate by adding the respective MIME type via concat_types,

concat_max_files numberp default: concat_max_files 10 context: http, server, location

Defines the maximum number of files that can be concatenated in a given context. Note that a given URI cannot be bigger than the page size of your platform. On Linux you can get the page size issuing:

getconf PAGESIZE

Usually is 4k. So if you try to concatenate a lot of files together in a given context you might hit this barrier. To overcome that OS defined limitation you must use the large_client_header_buffers directive. Set it to the value you need.