add &progressive=true (or &progressive=1-nnn)
e.g.
&progressive=true : to return jpeg images in progressive format
&progressive=10 : to return jpeg's larger than 10k in progressive format
WIC and GDI do not support encoding of progressive Jpegs. However, the FreeImageBuilder and FreeImageEncoder plugins can support it, and if they are being used, &progressive=true will work (this is an undocumented feature in the current release). The &progressive=minkb format will not be implemented, as it would require recursive compression passes to discover the size.
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WIC and GDI do not support encoding of progressive Jpegs. However, the FreeImageBuilder and FreeImageEncoder plugins can support it, and if they are being used, &progressive=true will work (this is an undocumented feature in the current release). The &progressive=minkb format isn't supported yet.