Sorry for opening another issue on this topic (#77, #78), but I'm trying out the new native http2 support in Node.js and compression (1.7.1) fails with:

TypeError: this._implicitHeader is not a function
    at Http2ServerResponse.write (node_modules/compression/index.js:84:14)

As far as I see it, this method isn't part of the public API of http.ServerResponse. Shouldn't compression simply call if (!this.headersSent) this.writeHead(this.statusCode) (in a helper function) instead of depending on undocumented API?