IP地址作为AppHarbor / App Engine urlfetch的主机名，用于缓存DNS查找

Question

I have an AppHarbor app that I'm using as an external service which will get requested by my other servers which use Google App Engine (python). The appharbor app is basically getting pinged a lot to process some data that I send it.

Because I'll be constantly pinging the service, and time is important, is it possible to reference my appharbor app through its IP address and not the hostname? Basically I want to eliminate having to do DNS lookups and speed up the response.

I'm using Google App Engine's urlfetch ( https://developers.google.com/appengine/docs/python/urlfetch/overview ) to do the request. Is caching the ip address something urlfetch is already doing under the covers? If not, is it possible to do so?

Answer 1

我怀疑DNS查找将成为你的瓶颈，但无论如何，只要我能看到DNS查找被系统缓存（至少对于TTL）。

Answer 2

You can theoretically send requests directly to an IP address, but you would have to also pass the host header so that the AppHarbor routing layer can figure out what application gets the request.

As Shay mentions, you shouldn't do this though - DNS queries are cached and are not likely to be a bottleneck and you're setting yourself up for breakage because the IP address might change with the domain being pointed to a new IP.

Answer 3

注册AppEngine Sockets Trusted Tester（ 这里 ）并使用普通的python：

socket.gethostbyname(...)