Please don't.
The authority on the definition of SI units is very clear:
> The hertz shall only be used for periodic phenomena and the becquerel shall only be used for stochastic processes in activity referred to a radionuclide
Neither is usually the case for requests.
Clearly, we should place a radioactive source, a Geiger counter, and a computer in a sealed box. Every time the counter registers a decay, the computer performs a HTTP GET. Thus, we end up with Schrödinger's webserver...
There’s an even stronger reason not to given in the same document:
"The special names becquerel, gray and sievert were specifically introduced because of the dangers to human health that might arise from mistakes involving the units reciprocal second… "