Return best communicator for endpoints based on response time If no valid communicator is found nil and an error is returned.

create valid communicators for endpoints if withMetrics is set, the slice will be sorted by metrics, so the first communicator is the best and the worst is last otherwise the communicators will be in the same order as the endpoints.

pretty quick but does not optimize load to endpoints based on metrics.

caution this causes n + 1 round trips with n being the number of endpoints.

Request.

Response.

ByteSlice.

handler function.

Headers headers are stored in a map[string]string in contrast to the way the net/http package stores them (map[string][]string) the values of the header are stored in a string separated by semicolons.