koa-body will exhaust available cache directory space

[mvhz81]

Problem/Feature Request Summary

koa-body parse multipart/form-data request will exhaust available cache directory space

Environment Information

koa-body <= 4.20

Current Behavior

It will not delete cache file in cache directory
koa-body will parse all multipart/form-data request , even you not accept POST request or rquest uri not in route。so it is easy to happen。

Steps to Reproduce

app.use(koaBody({ multipart: true }));
routes(app);

Expected Behavior

auto delete cache file

Possible Solution

I have no idea

Context (Environment)

not exhaust available cache directory space