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This ordering ensures that the middleware relying on forwarded headers information can consume the header values for processing. After enabling the middleware if no ForwardedHeadersOptions are specified to the middleware, the default ForwardedHeadersOptions.ForwardedHeaders are ForwardedHeaders.None.Ĭonfigure the middleware with ForwardedHeadersOptions to forward the X-Forwarded-For and X-Forwarded-Proto headers.įorwarded Headers Middleware should run before other middleware. Forwarded Headers Middleware must be enabled for an app to process forwarded headers with UseForwardedHeaders. Outside of using IIS Integration when hosting out-of-process, Forwarded Headers Middleware isn't enabled by default. Other proxy server and load balancer scenarios If additional configuration is required, see the Forwarded Headers Middleware options. The middleware is configured to forward the X-Forwarded-For and X-Forwarded-Proto headers and is restricted to a single localhost proxy. The restricted configuration is due to trust concerns with forwarded headers, for example, IP spoofing. Forwarded Headers Middleware is activated to run first in the middleware pipeline with a restricted configuration specific to the ASP.NET Core Module. IIS/IIS Express and ASP.NET Core Moduleįorwarded Headers Middleware is enabled by default by IIS Integration Middleware when the app is hosted out-of-process behind IIS and the ASP.NET Core Module. For more information, see Forwarded Headers Middleware options and Configuration for a proxy that uses different header names. If the appliance uses different header names than X-Forwarded-For and X-Forwarded-Proto, set the ForwardedForHeaderName and ForwardedProtoHeaderName options to match the header names used by the appliance. Consult your appliance manufacturer's guidance if proxied requests don't contain these headers when they reach the app. Not all network appliances add the X-Forwarded-For and X-Forwarded-Proto headers without additional configuration. The ForwardedHeaders value is ForwardedHeaders.None, the desired forwarders must be set here to enable the middleware.The forwarded headers are named X-Forwarded-For and X-Forwarded-Proto.Only loopback addresses are configured for known proxies and known networks.There is only one proxy between the app and the source of the requests.: Set using the X-Forwarded-Host header value.įor more information on the preceding, see this GitHub issue.įorwarded Headers Middleware default settings can be configured.: Set using the X-Forwarded-Proto header value.
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For details, see the Forwarded Headers Middleware options. Additional settings influence how the middleware sets RemoteIpAddress.
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See Microsoft Security Advisory CVE-2018-0787 for information on an elevation-of-privileges vulnerability that affects systems where the proxy doesn't validate or restrict Host headers to known good values. Usually, proxies don't modify the Host header. The original value of the Host header field. The value may also be a list of schemes if the request has traversed multiple proxies. The value of the originating scheme, HTTP or HTTPS. The last proxy's IP address, and optionally a port number, are available as the remote IP address at the transport layer. The last proxy in the chain isn't in the list of parameters. In a chain of proxy servers, the first parameter indicates the client where the request was first made. This parameter may contain IP addresses and, optionally, port numbers. Holds information about the client that initiated the request and subsequent proxies in a chain of proxies. Forwarded headersīy convention, proxies forward information in HTTP headers. This information may be important in request processing, for example in redirects, authentication, link generation, policy evaluation, and client geolocation. Because an app receives a request from the proxy and not its true source on the Internet or corporate network, the originating client IP address must also be forwarded in a header.When HTTPS requests are proxied over HTTP, the original scheme (HTTPS) is lost and must be forwarded in a header.Proxy servers, load balancers, and other network appliances often obscure information about the request before it reaches the app: In the recommended configuration for ASP.NET Core, the app is hosted using ASP.NET Core Module, Nginx, or Apache.