Can a well-formed HTTP Request contain "NULL"?

Question

My OCSP client is sending me the following HTTP request:

POST <NULL> HTTP/1.0
  Content-Type: application/ocsp-request
  Content-Length: 120

The NULL is not mentioned in the RFC for HTTP 1.0. Does that make this a malformed request?

Answer 1

Section 5.1.2 of your RFC says:

1. The Request-URI is a Uniform Resource Identifier (Section 3.2)

2. Note that the absolute path cannot be empty

So according to it, <NULL> is not a valid Request URI.