req.ip represent in Express?req.ip gives you the IP address of the client making the request. It helps you know where the request came from.
req.hostname in Express?req.hostname returns the domain name or host from the request URL. It tells you which website or server the client is trying to reach.
req.ip when behind a proxy?Express looks at the X-Forwarded-For header if trust proxy is enabled. This helps get the real client IP even if the request passes through proxies.
req.hostname affected by the port number in the URL?No, req.hostname only returns the host name without the port number. For example, from http://example.com:3000, it returns example.com.
app.set('trust proxy', true) when using req.ip behind proxies?Without trusting the proxy, req.ip might show the proxy's IP instead of the real client IP. Setting trust proxy tells Express to use the correct client IP from headers.
req.ip return in Express?req.ip gives the IP address of the client making the request.
trust proxy is enabled?The X-Forwarded-For header contains the original client IP when behind proxies.
req.hostname return?req.hostname returns the domain or host part of the URL.
req.hostname include the port number if present in the URL?req.hostname excludes the port number from the host.
app.set('trust proxy', true) when using req.ip behind a proxy?Setting trust proxy lets Express trust proxy headers and get the real client IP.
req.ip works in Express and how proxies affect it.req.hostname returns and how it differs from the full URL.