WILMA delete NGSILD-Results-Count in response header

[kniggeongit]

Hello lT experts,

I found an issue, that I can't solve by myself. In our setup, each request passes KONG, WILMA, and ORION-LD. If I request some entities from type Parcel in the following way: https://aaa.bbb.de/FOO/WILMA/ngsi-ld/v1/entities?type=Parcel&count=true&limit=10

with Request Header Accept: application/ld+json I expect:

• an HTTP response with content-type: application/ld+json
• response header value NGSILD-Results-Count: 10

but I received:

• an HTTP response with content-type: application/ld+json; charset-utf-8
• response header without value for NGSILD-Results-Count

If I use the same request, but the request will not pass WILMA, the HTTP response is as expected. https://aaa.bbb.de/FOO/orion-ld/ngsi-ld/v1/entities?type=Parcel&count=true&limit=10

I take a deep HTTP traffic analysis on the network layer in front of ORION-LD, but both requests arrive at ORION-LD in the same way, only the response (received by the client) is different. I investigated that issue a bit deeper with Wireshark. The orion-ld output is correct in both requests. But if the orion-ld response is forwarded to WILMA, the WILMA's output doesn't contain the NGSILD-Results-Count anymore and the content type was changed. From my point of view, WILMA interferes here destructively.

I use the docker image quay.io/fiware/pep-proxy:8.4.0

Who can handle this issue and provide a fix?

[kniggeongit]

Hello Jason, thanks for the fast fix. It looks better now. But what I found that there is a little mismatch in the Response Header attributes names:

• If I request the count of entities and forward the request direct to orion-ld, the Response Header contains the attribute "NGSILD-Results-Count"
• If I request the count of entities and forward the request **to WILMA first ** and then to orion-ld, the Response Header contains the attribute "ngsild-results-count"

If someone expects an attribute name with capital letters, like orion-ld sends, he will not get the result at all.