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no message
Content-Type: text/html
Content-Length: 342
Update current:
a -> 1
b -> 2
c -> 3
{
"a":"-",
"b":"2",
"c":"3"
}
Insert:
a -> 1
b -> 2
c -> 3
d -> 4
{
"a":"1",
"b":"2",
"c":"3",
"d":"4"
}
Delete current:
a -> 1
b -> 2
c -> 3
{
"b":"2",
"c":"3"
}
Delete before current:
a -> 1
delete: b -> 2
c -> 3
{
"b":"2",
"c":"3"
}
Delete after current:
a -> 1
c -> 3
{
"a":"1",
"c":"3"
}