Embodiments of the disclosure disclose a method for sending information and a gateway. The method includes that: a gateway acquires user online information; the gateway monitors a Domain Name System (DNS) domain name inquiring message, forges a DNS server returning domain name parsing response, and sends the forged response to a core network element or a user terminal browser; the gateway receives a user HyperText Transfer Protocol (HTTP) request returned by the core network element or the user terminal browser; and the gateway inquires the user online information according to the user HTTP request, adds the user online information in the user HTTP request by taking the user online information as HTTP header information, and sends the user HTTP request including the HTTP header information to an internet content and service provider. With the technical solution of an embodiment of the disclosure, the problem that the internet content and service provider fails to acquire user online information of a mobile terminal user is solved.