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Pb calls http interface problem, return value JSON format, how to get return value?

Blob lblb_args

String ls_header

String ls_url

String ls_args

Long ll _ length

Integer li_rc

Li _ RC = GetContextService（“Internet“，iinet_base）

If li_rc = 1

Iinet = create n_iinet

Ir = create n_ir_msgbox

ls_url =“。 PostURL（ls _ URL，lblb_args，ls_header，ir）

If ... it will be over.