1、简介

“可以”

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if ($request_method = POST ) {
  return 405;
}
if ($args ~ post=140){
  rewrite ^ http://example.com/ permanent;
}

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location / {
    error_page 418 = @other;
    recursive_error_pages on;

    if ($something) {
        return 418;
    }

    # some configuration
    ...
}

location @other {
    # some other configuration
    ...
}

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# Here is collection of unexpectedly buggy configurations to show that
# if inside location is evil.

# only second header will be present in response
# not really bug, just how it works

location /only-one-if {
    set $true 1;

    if ($true) {
        add_header X-First 1;
    }

    if ($true) {
        add_header X-Second 2;
    }

    return 204;
}

# request will be sent to backend without uri changed
# to '/' due to if

location /proxy-pass-uri {
    proxy_pass http://127.0.0.1:8080/;

    set $true 1;

    if ($true) {
        # nothing
    }
}

# try_files wont work due to if

location /if-try-files {
     try_files  /file  @fallback;

     set $true 1;

     if ($true) {
         # nothing
     }
}

# nginx will SIGSEGV

location /crash {

    set $true 1;

    if ($true) {
        # fastcgi_pass here
        fastcgi_pass  127.0.0.1:9000;
    }

    if ($true) {
        # no handler here
    }
}

# alias with captures isn't correcly inherited into implicit nested
# location created by if

location ~* ^/if-and-alias/(?<file>.*) {
    alias /tmp/$file;

    set $true 1;

    if ($true) {
        # nothing
    }
}

1、简介

2、替代方案

3、已知错误

4、原因分析

5、如仍使用