Get Client/Browser IP

kushal.khatri · 2016-06-29T03:59:02+00:00

Thanks for taking the time to reply.After some research, i also came to that conclusion.Cheers,SOn Wednesday, 29 June 2016 21:59:41 UTC+1, agentzh wrote:Hel...

Get Client/Browser IP

kushal.khatri

Hey guys,

I'm trying to fetch client/browser IP from my code in lua. I use this:

local ip = ngx.var.remote_addr

It seems to work sometimes but sometimes it returns the load balancer IP. All my servers are behind a load balancer.

Is there any cleaner/better way to fetch the browser IP? What could be causing it to return load balancer IP sometimes only?

Thanks,

Kushal

rpaprocki

This is exactly what the X-Forwarded-For header was invented for: https://en.wikipedia.org/wiki/X-Forwarded-For

Since this is a header, there are a few ways to access it:

local client = ngx.req.get_headers()["X-Forwarded-For"]

Or via the automagic nginx variable:

local client = ngx.var.http_x_forwarded_for

On Tuesday, June 28, 2016 at 12:59:03 PM UTC-7, kushal khatri wrote:

Hey guys,

I'm trying to fetch client/browser IP from my code in lua. I use this:

local ip = ngx.var.remote_addr

It seems to work sometimes but sometimes it returns the load balancer IP. All my servers are behind a load balancer.
Is there any cleaner/better way to fetch the browser IP? What could be causing it to return load balancer IP sometimes only?

Thanks,
Kushal

kushal.khatri

I tried both ngx.req.get_headers()["X-Forwarded-For"] and ngx.var.http_x_forwarded_for, but they both come back with empty strings.

Is there anything i need to enable in configuration file for this to work? Or any other way of fetching this data?

On Tuesday, June 28, 2016 at 5:22:47 PM UTC-7, rpaprocki wrote:

This is exactly what the X-Forwarded-For header was invented for: https://en.wikipedia.org/wiki/X-Forwarded-For

Since this is a header, there are a few ways to access it:

local client = ngx.req.get_headers()["X-Forwarded-For"]

Or via the automagic nginx variable:

local client = ngx.var.http_x_forwarded_for

On Tuesday, June 28, 2016 at 12:59:03 PM UTC-7, kushal khatri wrote:
Hey guys,

I'm trying to fetch client/browser IP from my code in lua. I use this:

local ip = ngx.var.remote_addr

It seems to work sometimes but sometimes it returns the load balancer IP. All my servers are behind a load balancer.
Is there any cleaner/better way to fetch the browser IP? What could be causing it to return load balancer IP sometimes only?

Thanks,
Kushal

rpaprocki

You haven't told us anything about your existing load-balanced setup or how you expect your Nginx server to receive that data, so it's doubtful we'll be able to help you. If your load balancer is not sending those values, then obviously they will be empty strings when you try to retrieve them from the request headers.

On Tue, Jun 28, 2016 at 5:51 PM, kushal khatri <kushal...@gmail.com> wrote:

I tried both ngx.req.get_headers()["X-Forwarded-For"] and ngx.var.http_x_forwarded_for, but they both come back with empty strings.

Is there anything i need to enable in configuration file for this to work? Or any other way of fetching this data?

On Tuesday, June 28, 2016 at 5:22:47 PM UTC-7, rpaprocki wrote:
This is exactly what the X-Forwarded-For header was invented for: https://en.wikipedia.org/wiki/X-Forwarded-For

Since this is a header, there are a few ways to access it:

local client = ngx.req.get_headers()["X-Forwarded-For"]

Or via the automagic nginx variable:

local client = ngx.var.http_x_forwarded_for

On Tuesday, June 28, 2016 at 12:59:03 PM UTC-7, kushal khatri wrote:
Hey guys,

I'm trying to fetch client/browser IP from my code in lua. I use this:

local ip = ngx.var.remote_addr

It seems to work sometimes but sometimes it returns the load balancer IP. All my servers are behind a load balancer.
Is there any cleaner/better way to fetch the browser IP? What could be causing it to return load balancer IP sometimes only?

Thanks,
Kushal

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