POST url is responding with the 500 error

[mohammmadahmed]

not accepting JSON request

[mohammmadahmed]

I have a config file with the input URL, get URL is working fine but POST URL is responding with the 500 error.
This post method containing basic credential and input body with the JSON data.

input {
http_poller {
urls => {
profile => {
method => get
user => "username"
password => "password"
url => "http://localhost:8080/activiti-app/api/enterprise/profile"
headers => {
Accept => "application/json"
}
}
taskhistory => {
method => post
user => "username"
password => "password"
url => "http://localhost:8080/activiti-app/api/enterprise/historic-tasks/query"
body =>"{}"
headers => {
Accept => "application/json"
}
}
}
request_timeout => 60
schedule => { cron => "* * * * * UTC"}
codec => "json"
metadata_target => "http_poller_metadata"
}
}

However, above get URL is working fine but the POST method is failing with the 500 error. When I see in the application side in the log, it's complaining contentType is application/text but required Json. how to pass JSON body with the request type json?