Error Parsing HTTP Response Using Apama HTTP Client plugin - apama

Question

I am trying to do an HTTP call to a REST API using Apama HTTP Client plugin. I am able to send a request to the REST Resource, but while parsing the response, I am getting the below error.
WARN [20176] - Failed to parse the event "`{contentType:application/json,sag.type:apamax.httpserversample.HTTPResponse,http:{headers:{contentLength:50,content-type:application/json,content-length:50},statusCode:200,method:POST,path:/rest/POC_422837/WS/provider/apamaTestConn,cookies:{},statusReason:OK}}{body:{status:Hello Apama. How are you doing?}}"
from httpClient due to the error: Unable to parse event apamax.httpserversample.HTTPResponse:
Unable to parse string from the map '{status:Hello Apama. How are you doing?}':
Invalid datatype, could not cast to string`
The YAML Config file looks as below,
connectivityPlugins:
HTTPClientGenericTransport:
libraryName: connectivity-http-client
class: HTTPClient
startChains:
httpClient:
- apama.eventMap
- mapperCodec:
apamax.httpserversample.HTTPRequest:
towardsTransport:
mapFrom:
- metadata.http.path: payload.path
- metadata.requestId: payload.id
- metadata.http.method: payload.method
- payload: payload.data
defaultValue:
- metadata.contentType: application/json
- metadata.sag.type: HelloWorld
apamax.httpserversample.HTTPResponse:
towardsHost:
mapFrom:
- payload.body: payload
- payload.id: metadata.requestId
apamax.httpserversample.HTTPError:
towardsHost:
mapFrom:
- payload.id: metadata.requestId
- payload.code: metadata.http.statusCode
- payload.message: metadata.http.statusReason
- classifierCodec:
rules:
- apamax.httpserversample.HTTPResponse:
- metadata.http.statusCode: 200
- apamax.httpserversample.HTTPError:
- metadata.http.statusCode:
- jsonCodec:
filterOnContentType: true
- stringCodec
- HTTPClientGenericTransport:
host: ${CORRELATOR_HOST}
port: ${CORRELATOR_PORT}
Please help.

Answer 1

I believe the problem is that you map in the config
apamax.httpserversample.HTTPResponse:
towardsHost:
mapFrom:
- payload.body: payload
- payload.id: metadata.requestId
the payload of the response to HTTPResponse.body.
However, as you can see from the warning, the payload is actually a map, so you need to do
- payload.body: payload.status