nginx：如何获取包含破折号的 url args？

Question

我正在使用 nginx 变量 $arg_ 来获取 url 参数。

但我发现如果 url 类似于“http://foobar.com/search?field-keywords=foobar”，$arg_field_keywords 或 $arg_field-keywords 则不起作用。

我可以用 $arg_ 得到 field-keywords 吗？

提前致谢。

Answer 1

我找到了article，它有一个小技巧可以解决你的问题。

TLDR：

You can remap variables with complex names by using the map module as follows:

map $is_args $http_x_origin {
  default $http_x-origin;
}

The trick is that map does not fully parse its arguments. The syntax is: map A X { default Y; }, with:

A any variable, preferably one that does not trigger much internal processing (since nginx configs are declarative, using a variable evaluates it). I use $is_args because it’s cheap to calculate.

X is the name for the new variable you’ll be creating, i.e. the map target.

Y is the name of the variable you want to access. At this point, it can contain dashes, because map does its own parsing.

我猜它也可能适用于 $args_。

Answer 2

使用openresty/1.11.2.4，接受的答案中提到的map方法对我不起作用。但是由于 openresty 带有预编译的 Lua 模块，我可以使用下面的代码来完成它：

set $dataArg '';
set_by_lua_block $dataArg { return ngx.req.get_uri_args()["data-arg"] }
proxy_cache_key $scheme$proxy_host$uri$is_args$dataArg;

Answer 3

虽然 lua 可能工作，但我们有 nginx 没有 lua 支持。谷歌搜索我从上游开发人员那里找到了以下答案

While this may currently work, I wouldn't recommend relying on this - as this is rather a bug than a desired behaviour. This will stop working as long as support for multiple variables will be added to map.

Instead, I would recommend to use regexp-based parsing of the $args variable as Francis suggests. This can be done trivially with map, like this:
map $args $param_with_dash {
    "~(^|&)param-name=(?<temp>[^&]+)"  $temp;
}

参考：https://marc.info/?l=nginx&m=141589036701879&w=2

Answer 4

使用 map 指令获取值参数 a-b

例如：

map $args $arg_a_b {
     ~*&?a-b=([^&]*) ;
     default         "";
}

匹配 a-b 不区分大小写，取值给 $arg_a_b，如果不设置为 null

nginx：如何获取包含破折号的 url args？

nginx: how to get url args which contain dash?

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