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nginx redirect fails if original request does not exist
P粉827121558
P粉827121558 2024-03-27 22:50:48
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Problem Statement: nginx does not seem to redirect when the original request is to a non-existent location. All other redirects seem to work fine. It's also possible that php is not executing the script on the redirected page. nginxconf is provided below.

Question: What am I missing and what do I need to do to make this work? Is it possible that nginx doesn't support redirecting from a page that doesn't exist?

Some context may be helpful: Here is a typical request being redirected: 

73.234.24.22 - - [30/May/2022:16:15:05 +0000] "GET /postevent3.asp?dta=05%2f30%2f22%2016%3a15%3a22%20507%20%2b149642656%20%2d254084882%20%2d0001787%20682829361 HTTP/1.1" 302 154 "-" "-"

Note that no page is displayed for this request; the request is dumped into a buffer, processed, and written to the database. See the end of this article for an excerpt from the nginx debug log.

Changing the URL is impractical as there are dozens of units scattered around the world. Most devices cannot be updated remotely.

The original site is no longer in use, using apache. The current site uses nginx. I'm not very familiar with web servers, so I'm probably missing something obvious. All ideas will be appreciated.

I also tried the following in the port 80 server block: 

location / {
    try_files $uri $uri/ /data/submit_legacy.php?$query_string;
}

nginxconf file------------------------------------------------ -- ----------------------------------------

server {
    listen 80;
    listen [::]:80;
    root /var/www/example.org;
    server_name example.org www.example.org ;
    index index.php index.html index.htm;
    expires    -1;
    rewrite_log on;
    error_log /var/www/example.org/data/http-org-submit.log debug;

#=# ========================================================================= #=#       
#=# Intercept request for postevent3.asp and send it data/submit_legacy.php,  #=# 
#=# be sure to change to return 301 when testing is complete                  #=#       
#=# ========================================================================= #=#       

    location = /postevent3.asp {
        return 302 https://example.org/data/submit_legacy.php?$query_string; 
    }       

    location / {
        return 302 https://$host$request_uri;
    }
}

server {
    listen [::]:443 ssl http2; # managed by Certbot
    listen 443 ssl http2; # managed by Certbot
    root /var/www/example.org;
    server_name example.org www.example.org;
    index index.php index.html index.htm;
    expires    -1;
    
    rewrite_log on;
    error_log /var/www/example.org/data/https-org-submit.log debug;

    location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }

    
    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.4-fpm.sock;
        fastcgi_param   SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }

    ssl_certificate /etc/letsencrypt/live/example.org/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/example.org/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypta/ssl-dhparams.pem; # managed by Certbot
    add_header Strict-Transport-Security "max-age=31536000;  includeSubDomains";
    add_header X-Frame-Options SAMEORIGIN;
    add_header X-Content-Type-Options nosniff;
    
    client_max_body_size 100M;  
}

Extracted from nginx debug file:--------------------------------------------- --------------------------------------------------- ---

2022/05/30 17:35:15 [debug] 37669#37669: *1 write new buf t:1 f:0 000055BC271BE300, pos 000055BC271BE300, size: 390 file: 0, size: 0
2022/05/30 17:35:15 [debug] 37669#37669: *1 http write filter: l:0 f:0 s:390
2022/05/30 17:35:15 [debug] 37669#37669: *1 http output filter "/postevent3.asp?dta=05%2f30%2f22%2017%3a35%3a32%20564%20%2b188886495%20%2b025481359%20%2b0005990%20570742577"
2022/05/30 17:35:15 [debug] 37669#37669: *1 http copy filter: "/postevent3.asp?dta=05%2f30%2f22%2017%3a35%3a32%20564%20%2b188886495%20%2b025481359%20%2b0005990%20570742577"
2022/05/30 17:35:15 [debug] 37669#37669: *1 image filter
2022/05/30 17:35:15 [debug] 37669#37669: *1 xslt filter body
2022/05/30 17:35:15 [debug] 37669#37669: *1 http postpone filter "/postevent3.asp?dta=05%2f30%2f22%2017%3a35%3a32%20564%20%2b188886495%20%2b025481359%20%2b0005990%20570742577" 000055BC271BE5D0
2022/05/30 17:35:15 [debug] 37669#37669: *1 write old buf t:1 f:0 000055BC271BE300, pos 000055BC271BE300, size: 390 file: 0, size: 0
2022/05/30 17:35:15 [debug] 37669#37669: *1 write new buf t:0 f:0 0000000000000000, pos 000055BC260A7AC0, size: 92 file: 0, size: 0
2022/05/30 17:35:15 [debug] 37669#37669: *1 write new buf t:0 f:0 0000000000000000, pos 000055BC260A7E20, size: 62 file: 0, size: 0
2022/05/30 17:35:15 [debug] 37669#37669: *1 http write filter: l:1 f:0 s:544
2022/05/30 17:35:15 [debug] 37669#37669: *1 http write filter limit 0
2022/05/30 17:35:15 [debug] 37669#37669: *1 writev: 544 of 544
2022/05/30 17:35:15 [debug] 37669#37669: *1 http write filter 0000000000000000
2022/05/30 17:35:15 [debug] 37669#37669: *1 http copy filter: 0 "/postevent3.asp?dta=05%2f30%2f22%2017%3a35%3a32%20564%20%2b188886495%20%2b025481359%20%2b0005990%20570742577"
2022/05/30 17:35:15 [debug] 37669#37669: *1 http finalize request: 0, "/postevent3.asp?dta=05%2f30%2f22%2017%3a35%3a32%20564%20%2b188886495%20%2b025481359%20%2b0005990%20570742577" a:1, c:1
2022/05/30 17:35:15 [debug] 37669#37669: *1 set http keepalive handler
2022/05/30 17:35:15 [debug] 37669#37669: *1 http close request
2022/05/30 17:35:15 [debug] 37669#37669: *1 http log handler
2022/05/30 17:35:15 [debug] 37669#37669: *1 free: 000055BC271E7D10, unused: 10
2022/05/30 17:35:15 [debug] 37669#37669: *1 free: 000055BC271BDE40, unused: 1875
2022/05/30 17:35:15 [debug] 37669#37669: *1 free: 000055BC2719E1B0
2022/05/30 17:35:15 [debug] 37669#37669: *1 hc free: 0000000000000000
2022/05/30 17:35:15 [debug] 37669#37669: *1 hc busy: 0000000000000000 0
2022/05/30 17:35:15 [debug] 37669#37669: *1 tcp_nodelay
2022/05/30 17:35:15 [debug] 37669#37669: *1 reusable connection: 1
2022/05/30 17:35:15 [debug] 37669#37669: *1 event timer add: 32: 65000:84579871
2022/05/30 17:35:15 [debug] 37669#37669: *1 http keepalive handler
2022/05/30 17:35:15 [debug] 37669#37669: *1 malloc: 000055BC2719E1B0:1024
2022/05/30 17:35:15 [debug] 37669#37669: *1 recv: eof:1, avail:-1
2022/05/30 17:35:15 [debug] 37669#37669: *1 recv: fd:32 0 of 1024
2022/05/30 17:35:15 [info] 37669#37669: *1 client 93.181.63.177 closed keepalive connection
2022/05/30 17:35:15 [debug] 37669#37669: *1 close http connection: 32
2022/05/30 17:35:15 [debug] 37669#37669: *1 event timer del: 32: 84579871
2022/05/30 17:35:15 [debug] 37669#37669: *1 reusable connection: 0
2022/05/30 17:35:15 [debug] 37669#37669: *1 free: 000055BC2719E1B0
2022/05/30 17:35:15 [debug] 37669#37669: *1 free: 000055BC271E7B00, unused: 136
2022/05/30 17:35:15 [debug] 37669#37669: *2 http header: "Host: www.example.org"
2022/05/30 17:35:15 [debug] 37669#37669: *2 http header done
2022/05/30 17:35:15 [debug] 37669#37669: *2 event timer del: 32: 84575067
2022/05/30 17:35:15 [debug] 37669#37669: *2 generic phase: 0
2022/05/30 17:35:15 [debug] 37669#37669: *2 rewrite phase: 1
2022/05/30 17:35:15 [debug] 37669#37669: *2 test location: "/"
2022/05/30 17:35:15 [debug] 37669#37669: *2 test location: "postevent3.asp"
2022/05/30 17:35:15 [debug] 37669#37669: *2 using configuration "=/postevent3.asp"
2022/05/30 17:35:15 [debug] 37669#37669: *2 http cl:-1 max:1048576
2022/05/30 17:35:15 [debug] 37669#37669: *2 rewrite phase: 3
2022/05/30 17:35:15 [debug] 37669#37669: *2 http set discard body
2022/05/30 17:35:15 [debug] 37669#37669: *2 http script copy: "https://example.org/data/submit_legacy.php?"
2022/05/30 17:35:15 [debug] 37669#37669: *2 http script var: "dta=10%2F14%2F02%2017%3A35%3A24%2000096%20%2B204823178%20%2B089853375%20%2B0008360%20634488566%20%0D%0A10%2F14%2F02%2017%3A35%3A27%2000096%20%2B204823175%20%2B089853369%20%2B0008402%20392294994%20%0D%0A10%2F14%2F02%2017%3A35%3A31%2000096%20%2B204823170%20%2B089853326%20%2B0008462%20215533034%20%0D%0A10%2F14%2F02%2017%3A35%3A32%2000096%20%2B204823166%20%2B089853317%20%2B0008472%20020574633%20%0D%0A"
2022/05/30 17:35:15 [debug] 37669#37669: *2 http finalize request: 302, "/postevent3.asp?dta=10%2F14%2F02%2017%3A35%3A24%2000096%20%2B204823178%20%2B089853375%20%2B0008360%20634488566%20%0D%0A10%2F14%2F02%2017%3A35%3A27%2000096%20%2B204823175%20%2B089853369%20%2B0008402%20392294994%20%0D%0A10%2F14%2F02%2017%3A35%3A31%2000096%20%2B204823170%20%2B089853326%20%2B0008462%20215533034%20%0D%0A10%2F14%2F02%2017%3A35%3A32%2000096%20%2B204823166%20%2B089853317%20%2B0008472%20020574633%20%0D%0A" a:1, c:1
2022/05/30 17:35:15 [debug] 37669#37669: *2 http special response: 302, "/postevent3.asp?dta=10%2F14%2F02%2017%3A35%3A24%2000096%20%2B204823178%20%2B089853375%20%2B0008360%20634488566%20%0D%0A10%2F14%2F02%2017%3A35%3A27%2000096%20%2B204823175%20%2B089853369%20%2B0008402%20392294994%20%0D%0A10%2F14%2F02%2017%3A35%3A31%2000096%20%2B204823170%20%2B089853326%20%2B0008462%20215533034%20%0D%0A10%2F14%2F02%2017%3A35%3A32%2000096%20%2B204823166%20%2B089853317%20%2B0008472%20020574633%20%0D%0A"
2022/05/30 17:35:15 [debug] 37669#37669: *2 http set discard body
2022/05/30 17:35:15 [debug] 37669#37669: *2 xslt filter header
2022/05/30 17:35:15 [debug] 37669#37669: *2 HTTP/1.1 302 Moved Temporarily
Server: nginx/1.18.0 (Ubuntu)
Date: Mon, 30 May 2022 17:35:15 GMT
Content-Type: text/html
Content-Length: 154
Connection: keep-alive
Location: https://example.org/data/submit_legacy.php?dta=10%2F14%2F02%2017%3A35%3A24%2000096%20%2B204823178%20%2B089853375%20%2B0008360%20634488566%20%0D%0A10%2F14%2F02%2017%3A35%3A27%2000096%20%2B204823175%20%2B089853369%20%2B0008402%20392294994%20%0D%0A10%2F14%2F02%2017%3A35%3A31%2000096%20%2B204823170%20%2B089853326%20%2B0008462%20215533034%20%0D%0A10%2F14%2F02%2017%3A35%3A32%2000096%20%2B204823166%20%2B089853317%20%2B0008472%20020574633%20%0D%0A
Expires: Mon, 30 May 2022 17:35:14 GMT
Cache-Control: no-cache

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P粉715304239
P粉7153042392024-03-28 10:47:44 1 floor

If my guess that the software making this request cannot interpret the 302 HTTP redirect code and make a new request is correct, then your only recourse is to handle the request within the HTTP block itself. instead of your current 

location = /postevent3.asp {
    return 302 https://example.org/data/submit_legacy.php?$query_string; 
}

You can check this configuration: 

location = /postevent3.asp {
    rewrite ^ /data/submit_legacy.php break;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$uri;
    fastcgi_pass unix:/run/php/php7.4-fpm.sock;
}

If you use this configuration, your requests will start showing up in the database, which definitely means my initial guess was correct.

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