anchor.diff:  [%header%autowidth.stretch]
   |===
   | encoding | tradeoffs
  -
  -| hex
  -| longer, case insensitive, slightly faster
  -
  -| base64
  -| shorter, case sensitive, slightly slower
  +| hex | longer, case insensitive, slightly faster
  +| base64 | shorter, case sensitive, slightly slower
   |===
   
   Benchmark results with go1.12.7:
  
positive.code: 
  go-camo is a go version of a https://github.com/atmos/camo[camo] server.
  
  A https://github.com/atmos/camo[camo] server is a special type of image proxy
  that proxies non-secure images over SSL/TLS, in order to prevent mixed content
  warnings on secure pages. The server works in conjunction with back-end code
  that rewrites image URLs and signs them with an http://en.wikipedia.org/wiki/HMAC[HMAC].
  
  == How it works
  
  
negative.code: 
  === Metrics
  
  When the `--metrics` flag is used, the service will expose a Prometheus-compatible `/metrics` endpoint.
  This can be used by monitoring systems to gather data.
  
  The endpoint includes all of the default `go_` and `process_`.
  In addition, a number of custom metrics.
  
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  |===
  