def report(self, options):
        raise NotImplementedError("abstract method - implement in subclass")
Test that an exception is raised when the PROXY header is missing.
dataset/ETHPy150Open CGATOxford/cgat/scripts/chain2stats.py/ChainCounter.report--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/protocols/haproxy/test/test_v1parser.py/V1ParserTests.test_missingPROXYHeaderValue