what is the difference between request.ip and request.raw.ip in fastify? - fastify

Question

Difference between request.ip and request.raw.ip in fastify.
Request
The first parameter of the handler function is Request.
Request is a core Fastify object containing the following fields:
raw - the incoming HTTP request from Node core
ip - the IP address of the incoming request
It contains more fields I am just showing relevant fields to my question.
you can check more field out here -> https://www.fastify.io/docs/latest/Request/

Answer 1

Difference between request.ip and request.raw.ip in fastify.
There is a difference only if your server runs behind a proxy/balancer.
Let's make an example:
Client IP: 123.123.123.123
Balancer IP: 10.10.10.10
The request.raw.connection.remoteAddress will be 10.10.10.10
The request.ip will be 123.123.123.123 (only if trustProxy option is enabled) or it will ba as the raw one
Many other ones are just shortcuts such as hostname or url.
Ip example:
Runs locally the Fastify server
{"ip":"127.0.0.1","ipRaw":"","ipRemote":"127.0.0.1"}
Runs behind a ngnix with trust proxy (192.168.128.2 is nginx)
{"ip":"192.168.128.1","ipRaw":"","ips":["192.168.128.2","192.168.128.1"],"ipRemote":"192.168.128.2"}
Runs behind a ngnix without trust proxy (return the caller ip)
{"ip":"192.168.128.2","ipRaw":"","ipRemote":"192.168.128.2"}
You can play with it:
const fastify = require('fastify')({
logger: true,
trustProxy: true
})
fastify.get('/', async (request, reply) => {
return {
ip: request.ip,
ipRaw: request.raw.ip || '',
ips: request.ips,
ipRemote: request.raw.connection.remoteAddress
}
})
fastify.listen(5000, '0.0.0.0')
version: "3.9"
services:
localnode:
build:
context: ./
dockerfile: Dockerfile-fastify
ports:
- "5000:5000"
nginx:
build:
context: ./
dockerfile: Dockerfile
ports:
- "8080:80"
Fastify
FROM node:alpine
COPY package.json ./
RUN npm install
COPY ./proxy.js .
EXPOSE 5000
CMD ["node", "proxy.js"]
nginx
FROM nginx
EXPOSE 8080
COPY default.conf /etc/nginx/conf.d/
and the config
server {
proxy_http_version 1.1;
proxy_set_header Host $host;
proxy_set_header Connection "";
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass http://localnode:5000;
}
}
PS: these docker files are not for production