Github user cakofony commented on the issue:

    https://github.com/apache/httpcomponents-core/pull/49
  
    > Could there be fewer changes if a CopyOnWriteArrayList is used instead of 
an ArrayList in HeaderGroup?
    
    Possibly, I was worried about the performance aspects of CoW. HeaderGroup 
tends to iterate by index internally to avoid Iterator allocation, which still 
wouldn't be safe.


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