How to simplify nginx config when handling outdated browsers?-CodePudding

Example nginx.conf, I'd like to move conditional rewrite from location directives, but have no idea how:

# https://user-agents.net/browsers
map $http_user_agent $outdated {
    default 0;
    ...
}

server {
    ...
    location ~ (not-supported) {
        # empty
    }

    location / {
        if ($outdated = 1) {
            rewrite ^ /not-supported/index.html break;
        }
        try_files $uri $uri/ /index.html =404;
    }

    ...
}

CodePudding user response：

You can use rewrite directive either at the server or at the location contexts. The difference is the request processing phase where that rewrite directive will be processed (NGX_HTTP_SERVER_REWRITE_PHASE for the firest case, NGX_HTTP_REWRITE_PHASE for the second one). Avoid regular expressions whenever possible. When you use a rewrite directive at the location context, you should use last flag for the rewrite directive instead of break one to force new search of the location for the rewritten URI. I also recommend to make it internal to prevent direct access to the /not-supported/ directory. So use either

location /not-supported/ {
    internal;
}

location / {
    if ($outdated = 1) {
        rewrite ^ /not-supported/index.html last;
    }
    try_files $uri $uri/ /index.html;
}

if ($outdated = 1) {
    rewrite ^ /not-supported/index.html;
}

location /not-supported/ {
    internal;
}

location / {
    try_files $uri $uri/ /index.html;
}

You can have that non-supported directory with the index.html file inside either under your web root directory or anywhere else (for the last case you'll need to define a custom root for the location /not-supported/ { ... }). Make sure that rewrite rule do not interfere with any others may be present at the server context.

CodePudding user response：

Made it work by:

http {
# https://user-agents.net/browsers
map $http_user_agent $outdated {
    default 0;
    "~Opera"                                                    1; # Opera all
    "~MSIE"                                                     1; # MSIE all
    "~Trident/[1-7]\."                                          1; # MSIE all
    "~Chrome/(([1-9]{1})|([0-7]{1}[0-9]{1})|(8[0-6]{1}))\."     1; # Chrome 1.* - 86.*
    "~YaBrowser/(([1-9]{1})|([1-9]{1}[0-8]{1}))\."              1; # Yandex 1.* - 18.*
    "~Firefox/(([1-9]{1})|([0-7]{1}[0-9]{1})|(8[0-3]{1}))\."    1; # Firefox 1.* - 83.*
    "~EdgA?/(([1-9]{1})|([0-7]{1}[0-9]{1})|(8[0-6]{1}))\."      1; # Edge/MobileEdge 1.* - 86.*
    "~Version/(([1-9]{1})|([1-9]{1}[0-1]{1}))\."                1; # Safari 1.* - 11.*
}

server {
    listen       8080 default_server;
    root         /opt/app-root/src;

    if ($uri ~ /not-supported) {
        set $outdated 0;
    }

    if ($outdated = 1) {
        rewrite ^ /not-supported/index.html last;
    }

    location / {
    .......