Why request POST to become ST

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there is a certain probability of exception:
request POST becomes ST display No resource method found for ST
request GET becomes T display No resource method found for T
what is the possible cause of this?

Mar.23,2021

this is for network reasons.
the server is mapped from the intranet to the extranet and then linked to others.
the corporate firewall seems to have processed the request.
the root cause of the problem has not been found, so the network problem of changing to a foreign network server will not occur again.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b40a54-2c533.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b40a54-2c533.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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