Consider only compressing larger than minimum bytes

[shelakel]

Consider using a buffer for the response and only doing the GZIP compression at the end when the amount of bytes to be written exceeds a threshold. See:

http://webmasters.stackexchange.com/questions/31750/what-is-recommended-minimum-object-size-for-gzip-performance-benefits

[haoxins]

+1 for this.
https://developers.google.com/speed/docs/best-practices/payload#GzipCompression

[slogsdon]

@shelakel @coderhaoxin Sorry for the delay! I'm hoping to tackle this soon (like this weekend if possible).

[13k]

👍

I came here because the middleware is compressing empty body responses (as in header-only responses). This doesn't seem to be right, though, since the Content-Length for an empty body is obviously zero and a compressed empty response has the gzip header overhead (looks like 23 bytes).

[13k]

Also in the case of zero-length compressed responses, it forces the client to actually decompress the response body (which will then be empty), consuming unnecessary processing time.