For upper state machines, case CACHE_EVENT_OPEN_READ, doesn't mean first_buf 
has header Doc.

In read form write process, the cache_vc->alternate save head info, the 
cache_vc->first_buf is NULL. 

I think ShowCache::lookup_url should call Cache::lookup function, In case,  
cache_vc callback upstream ECACHE_DOC_BUSY.  or check cache_vc->first_buf is 
NULL, response Cache Lookup Busy.

[ Full content available at: 
https://github.com/apache/trafficserver/issues/4328 ]
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