In a content negotiation field, what does the parameter q=0 mean, and what weight applies when no q parameter is given?
q=0 means lowest preference; the default weight is 0.5
q=0 means not acceptable; the default weight is 1✓Bonne réponse
q=0 means no preference expressed; the default weight is 0
q=0 means lowest preference; the default weight is the position in the list
Explication
A quality value of 0 is a rejection, not merely a low ranking; 0.001 is the least preferred value that still expresses acceptance. Omitting q entirely means weight 1, which is why an unqualified entry outranks anything carrying an explicit fraction.