Filling Location header in njs subrequest #603

userVF · 2025-04-01T03:48:39Z

userVF
Apr 1, 2025

Hi All!
I need fill Location header with value of r.subrequest reply in case of status = 302.
Nginx version: 1.26.2
myhost.local.conf:

server {
  server_name myhost.local;
  js_import 'lib.js';
  location / {
    js_content lib.check;
  }
  location = /app {
    internal;
    proxy_pass http://localhost:3000;
  }
}

njs version: 0.8.7
lib.js:

async function check(r) {
 let reply = await r.subrequest('/app')
 if (reply.status == 302) {
   r.headersOut['Location'] = reply.headersOut['Location'] <--doesn't work 
   r.headersOut['Foo'] = 'Bar' <--works      
 }
 r.return(reply.status, reply.responseText) 
}

The reply.headersOut has Location with proper value, Foo header is filled as expected.
The problem: Location header always contains something like Host value instead of reply.headersOut['Location']:

$curl -I myhost.local
HTTP/1.1 302 Moved Temporarily
Location: http://myhost.local/ <-- Host
Foo: Bar <--ok

Could someone please suggest how to solve this problem?

Answered by userVF

Apr 2, 2025

I found the solution here.
The second argument in r.return can be a redirect URL for 302 code:

  if (reply.status == 302) {
    r.return(reply.status, reply.headersOut['Location'])
    return
  }
  r.return(reply.status, reply.responseText)

View full answer

userVF · 2025-04-02T07:36:22Z

userVF
Apr 2, 2025
Author

I found the solution here.
The second argument in r.return can be a redirect URL for 302 code:

  if (reply.status == 302) {
    r.return(reply.status, reply.headersOut['Location'])
    return
  }
  r.return(reply.status, reply.responseText)

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Filling Location header in njs subrequest #603

userVF Apr 1, 2025

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userVF Apr 2, 2025 Author

userVF
Apr 1, 2025

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