Openresty: ngx.var vs ngx.ctx

Question

What's the use case differences between ngx.var and ngx.ctx ? When should one use var vs ctx ? Are there any performance differences one should know about?

Answer 1

我绝对不是主题专家，但是从我的搜索冒险中可以得出的结论是：ngx.var比ngx.ctx昂贵，而且ngx.var仅适用于字符串。