Rest APi Update iRule

Most likely due to the special characters not escaped properly (depending on where you run) or LF (0x0A) not written in the literal \n (0x5C 0x6E) in a JSON body. The following curl request worked for me.

 cat sat
{
  "apiAnonymous":" this is a test\n
when CLIENT_ACCEPTED {\n
  log local0. \"Hello World\"\n
}"
}
 curl -sku admin:admin https:///mgmt/tm/ltm/rule/satoshi -X PATCH -H "Content-Type: application/json" -d@sat
{
    "apiAnonymous": " this is a test\nwhen CLIENT_ACCEPTED {\n  log local0. \"Hello World\"\n}",
    "fullPath": "satoshi",
    "generation": 986,
    "kind": "tm:ltm:rule:rulestate",
    "name": "satoshi",
    "selfLink": "https://localhost/mgmt/tm/ltm/rule/satoshi?ver=13.1.0"
}