如何快速学习OpenResty的API

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restydoc -s ngx.arg

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ngx.arg
       syntax: val = ngx.arg[index]

       context: set_by_lua*, body_filter_by_lua*

       When this is used in the context of the set_by_lua* directives, this
       table is read-only and holds the input arguments to the config
       directives:

            value = ngx.arg[n]

       Here is an example

            location /foo {
                set $a 32;
                set $b 56;

                set_by_lua $sum
                    'return tonumber(ngx.arg[1]) + tonumber(ngx.arg[2])'
                    $a $b;

                echo $sum;
            }

       that writes out 88, the sum of 32 and 56.

       When this table is used in the context of body_filter_by_lua*, the
       first element holds the input data chunk to the output filter code and
       the second element holds the boolean flag for the "eof" flag indicating
       the end of the whole output data stream.

       The data chunk and "eof" flag passed to the downstream Nginx output
       filters can also be overridden by assigning values directly to the
       corresponding table elements. When setting "nil" or an empty Lua string
       value to "ngx.arg[1]", no data chunk will be passed to the downstream
       Nginx output filters at all.