日志是这样的咋回事？

180.108.85.142 – – [02/Oct/2019:08:13:10 +0000] "GET /otsmobile/app/mgs/mgw.htm?operationType=com.cars.otsmobile.queryLeftTicketA&requestData=%5B%7B%22train_date%22%3A%2220191005%22%2C%22purpose_codes%22%3A%2200%22%2C%22from_station%22%3A%22CDW%22%2C%22to_station%22%3A%22RDQ%22%2C%22station_train_code%22%3A%22%22%2C%22start_time_begin%22%3A%220000%22%2C%22start_time_end%22%3A%222400%22%2C%22train_headers%22%3A%22QB%23%22%2C%22train_flag%22%3A%22%22%2C%22seat_type%22%3A%22%22%2C%22seatBack_Type%22%3A%22%22%2C%22ticket_num%22%3A%22%22%2C%22dfpStr%22%3A%22c5kaE0jYvnqICCPlwCp5YVFdExudVMmjR_rK75Yj6IMzktV3Gn8PPGJ50HO_WF5R7aG2JiDXwrugAiA18f_isn7XlV7zliwGbOzWht4LiJPp0gA0VnqDAs2CpASNEEKdtZ6nwxQDTlFAqTEsAz0yX0KDmgkBph1c%22%2C%22baseDTO%22%3A%7B%22check_code%22%3A%229d0395946a0ec38dc4448179b788bf4c%22%2C%22device_no%22%3A%22XZCra0SpXo0zMKmjTN58nVfa%22%2C%22mobile_no%22%3A%22%22%2C%22os_type%22%3A%22a%22%2C%22time_str%22%3A%2220191002161221%22%2C%22user_name%22%3A%22%22%2C%22version_no%22%3A%224.2.36%22%7D%7D%5D&ts=1570003941295&sign=45f926faeb6b0165a2167ed2c0898568 HTTP/1.1" 502 161 "-" "Go-http-client/1.1"
114.216.203.153 – – [02/Oct/2019:08:13:10 +0000] "GET /otsmobile/app/mgs/mgw.htm?operationType=com.cars.otsmobile.queryLeftTicketA&requestData=%5B%7B%22train_date%22%3A%2220191016%22%2C%22purpose_codes%22%3A%2200%22%2C%22from_station%22%3A%22KNM%22%2C%22to_station%22%3A%22DKM%22%2C%22station_train_code%22%3A%22%22%2C%22start_time_begin%22%3A%220000%22%2C%22start_time_end%22%3A%222400%22%2C%22train_headers%22%3A%22QB%23%22%2C%22train_flag%22%3A%22%22%2C%22seat_type%22%3A%22%22%2C%22seatBack_Type%22%3A%22%22%2C%22ticket_num%22%3A%22%22%2C%22dfpStr%22%3A%22%22%2C%22baseDTO%22%3A%7B%22check_code%22%3A%22ef174b1cdc981232be58b16a252a6902%22%2C%22device_no%22%3A%22XZNEQd8ZSLszMLcw2idlZFdt%22%2C%22mobile_no%22%3A%22%22%2C%22os_type%22%3A%22a%22%2C%22time_str%22%3A%2220191002155851%22%2C%22user_name%22%3A%22%22%2C%22version_no%22%3A%224.2.36%22%7D%7D%5D&ts=1570003131560&sign= HTTP/1.1" 502 161 "-" "Go-http-client/1.1"