shoulda opened a new issue #6424:
URL: https://github.com/apache/apisix/issues/6424
### Issue description
when i use apisix as a reverse proxy to upload a 1.4M file, the size of
vars.request_length in access.log is correct (1.4M),but Using prometheus
plugins to count, the ingress is 2.8M.
blew pictures the first is access.log the second is prometheus plugins
count
<img width="1252" alt="wecom-temp-d3657b0e4bf9e6e16c09e05bfae0ba36"
src="https://user-images.githubusercontent.com/29837621/155254678-1164d219-c666-4ba7-a39b-8faa9868849b.png">

### Environment
- apisix version (apisix2.9):
- OS (MacOS):
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