How to find out the rule of these letters(the encrypted Parameters ) in this url.(for the web crawler)

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http://210.65.131.75/SERVICE/QueryPrice/ead62edaaa88f218e246c8c9fd9fd418?q=VTJGc2RHVmtYMS91MG4zSkxwRzhqQVM2THRwWm4xZnNscERxWjdjZFg1ODJsdEg1TlVoMFlDbVc0QjZMMGdyZUdFW