Changes to POST /reactors/:id/react

removed the success response with the status 202

added the non-success response with the status 503

the request's body type changed from object to no type

removed the request property args

removed the request property callback_url

added the new optional request property callback_url

added the optional property body to the response with the 200 status

added the optional property headers to the response with the 200 status

added the success response with the status 202

request body became required

added the pattern ^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$ to the path request parameter id

for the path request parameter id, the maxLength was set to 36

api operation id Reactors.React removed and replaced with Reactors_React