Does Cloudflare WAF (method SKIP) change original HTTP_CONTENT_LENGTH header?

I can’t figure out who is cutting off data - sending side or Cloudflare? So does Cloudflare WAF (method SKIP) change original HTTP_CONTENT_LENGTH header or no?

Cloudflare doesn’t change original HTTP_CONTENT_LENGTH header. Cloudflare passes all HTTP request headers to your origin web server and adds additional headers in the lists at Cloudflare HTTP request headers · Cloudflare Fundamentals docs.

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