I'm using libcurl to send HTTP requests to a specific IP address, but with a custom host name. I have two use cases that rely on this behavior:
1. I have a web application that is scaled across multiple servers, each with its own IP address but all having the same domain name. The domain name of the web app resolves to multiple IP address. A client app resolves the domain name, gets the list of all IP addresses, and sends requests to each server in the web app cluster in a round-robin manner. The web app does this by sending a request to "https://(ip address here)/some/uri" while setting the request's Host header to the domain name. 2. Phusion Passenger is a Ruby application server which integrates into an existing web server (e.g. Apache). Application processes are spawned on demand. Some users prefer certain app processes to be started immediately after the web server starts. This can be achieved through the PassengerPreStart option: the user sets something like "PassengerPreStart http://mywebapp.com/";, which will cause Phusion Passenger to send a request to http://127.0.0.1/ with "Host: mywebapp.com" immediately after the web server is started. This will cause Phusion Passenger to spawn the app. There are many technical reasons why Phusion Passenger needs an HTTP request to spawn an app instead of doing it directly, but for brevity's and relevance's sake I've omitted the details. libcurl currently sets the TLS Server Name Indication value to the URL's host name. This makes it impossible to use Server Name Indication in the described use cases. The attached patch solves this problem by setting the Server Name Indication value to that of the custom Host header, if any. Any feedback about this patch would be greatly appreciated. With kind regards, Hongli Lai -- Phusion | The Computer Science Company Web: http://www.phusion.nl/ E-mail: [email protected] Chamber of commerce no: 08173483 (The Netherlands)
0001-OpenSSL-SNI-host-name-should-be-set-to-the-custom-Ho.patch
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