官方說明文件：
https://www.nginx.com/blog/creating-nginx-rewrite-rules/
解法：
This is not ideal and it would be far better to have a clean workflow instead of doing this. But for curiosity, this could be informative to people that would wonder if it’s possible.
Yes it is, using a combination of error_page, rewrite, map, proxy_intercept_errors and proxy_redirect directives and $upstream_http var pattern.
Keep in mind that it’s going far off the path nginx is designed to be driven on.
map $upstream_http_location $redirect_uri {
"~http://[^/]+/(?<location_uri>.*)$" "$location_uri";
}
upstream origin {
server origin1.com;
}
server {
listen 80;
server_name nginx-front.com;
proxy_set_header Host "origin1.com";
proxy_redirect http://origin1.com/ /;
location ~ ^/hls/(\w+)\.mp4\.m3u8$ {
proxy_pass http://origin/m3ugen/segsrc/\.mp4;
proxy_intercept_errors on;
error_page 301 302 = @handler;
}
location @handler {
rewrite ^ /$redirect_uri break;
proxy_pass http://origin;
}
}It is possible for nginx to intercept the 302 response code and process internally. I set up a test scenario which worked using this:
location /some/uri/ {
error_page 302 = @fallback;
proxy_intercept_errors on;
proxy_pass ...;
}
location @fallback {
rewrite ^ /some/other/uri last;
}
This would of course be a blanket intercept without regard for the value of the response headers, but that may be adequate for your requirement. See this and this for more.
I succeeded in solving a more generic case when a redirect location can be any external URL.
server {
...
location / {
proxy_pass http://backend;
# You may need to uncomment the following line if your redirects are relative, e.g. /foo/bar
#proxy_redirect / /;
proxy_intercept_errors on;
error_page 301 302 307 = @handle_redirects;
}
location @handle_redirects {
set $saved_redirect_location '$upstream_http_location';
proxy_pass $saved_redirect_location;
}
}
Alternative approach, which is closer to what you describe, is covered in ServerFault answer to this question: http://serverfault.com/questions/641070/nginx-302-redirect-resolve-internally
修改 sample:
https://gist.github.com/sirsquidness/710bc76d7bbc734c7a3ff69c6b8ff591
資料來源：
http://serverfault.com/questions/641070/nginx-302-redirect-resolve-internally