http Busy property
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Applies to
acHTTP and acSendMail components.  

property Busy: Boolean; // Read-only !!  

The Busy property determines whether the HTTP component (its thread) are busy when its execute some operations. When Busy property is True, the acHTTP currently requesting/downloading data from the Web, or processing OnDone event handler.  

iiwarning You can NOT download any data when the HTTP is busy, and must wait until component done all operations. The Read method will return False when the component is busy.  

See also
Read method; OnDone and OnAnyError events;  
Running property of acThread component.