Ocelot returns 500 from Consul for the first request

[chaitanyaphanikumar]

I have registered 3 services in Consul. (IdentityService is one of them). While trying to access this service through Ocelot, I had the below exception and Postman response returned 500 Internal server error.

Second request to this service returned 503 Service Unavailable.

Third request was Success and returned 200 OK.

Did I miss something to configure ?

Ocelot Configuration.json

{
"DownstreamPathTemplate": "/api/v1/identity/register",
"DownstreamScheme": "https",
"UseServiceDiscovery": true,
"ServiceName": "IdentityService",
"UpstreamPathTemplate": "/v1/identity/register",
"UpstreamHttpMethod": [ "POST" ],
"LoadBalancerOptions": {
"Type": "LeastConnection"
}
}
],
"GlobalConfiguration": {
"RequestIdKey": "OcRequestId",
"BaseUrl": "https://localhost:44311",
"ServiceDiscoveryProvider": {
"Scheme": "http",
"Host": "localhost",
"Port": 8500,
"Type": "Consul"
}
}

Exception (500 Reponse):-

Consul.ConsulRequestException: Unexpected response, status code ServiceUnavailable:

ERROR

The requested URL could not be retrieved

The following error was encountered while trying to retrieve the URL: http://localhost:8500/v1/health/service/IdentityService

Connection to ::1 failed.

The system returned: (111) Connection refused

The remote host or network may be down. Please try the request again.

Your cache administrator is webmaster.

---

Generated Mon, 20 Jul 2020 06:16:02 GMT by moatcmn-deb1 (squid/3.5.23)

at Consul.GetRequest`1.Execute(CancellationToken ct)
at Ocelot.Provider.Consul.Consul.Get()
at Ocelot.LoadBalancer.LoadBalancers.LoadBalancerFactory.<>c__DisplayClass2_0.<b__1>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at Ocelot.LoadBalancer.LoadBalancers.LeastConnection.Lease(DownstreamContext downstreamContext)
at Ocelot.LoadBalancer.Middleware.LoadBalancingMiddleware.Invoke(DownstreamContext context)
at Ocelot.QueryStrings.Middleware.ClaimsToQueryStringMiddleware.Invoke(DownstreamContext context)
at Ocelot.Headers.Middleware.ClaimsToHeadersMiddleware.Invoke(DownstreamContext context)
at Ocelot.Authorisation.Middleware.AuthorisationMiddleware.Invoke(DownstreamContext context)
at Ocelot.Claims.Middleware.ClaimsToClaimsMiddleware.Invoke(DownstreamContext context)
at Ocelot.Authentication.Middleware.AuthenticationMiddleware.Invoke(DownstreamContext context)
at Ocelot.RequestId.Middleware.ReRouteRequestIdMiddleware.Invoke(DownstreamContext context)
at Ocelot.RateLimit.Middleware.ClientRateLimitMiddleware.Invoke(DownstreamContext context)
at Ocelot.Request.Middleware.DownstreamRequestInitialiserMiddleware.Invoke(DownstreamContext context)
at Ocelot.Headers.Middleware.HttpHeadersTransformationMiddleware.Invoke(DownstreamContext context)
at Ocelot.Security.Middleware.SecurityMiddleware.Invoke(DownstreamContext context)
at Ocelot.Middleware.Multiplexer.Multiplexer.Fire(DownstreamContext context, OcelotRequestDelegate next)
at Ocelot.Middleware.Multiplexer.Multiplexer.Multiplex(DownstreamContext context, ReRoute reRoute, OcelotRequestDelegate next)
at Ocelot.DownstreamRouteFinder.Middleware.DownstreamRouteFinderMiddleware.Invoke(DownstreamContext context)
at Ocelot.Responder.Middleware.ResponderMiddleware.Invoke(DownstreamContext context)
at Ocelot.Middleware.Pipeline.MapWhenMiddleware.Invoke(DownstreamContext context)
at Ocelot.Errors.Middleware.ExceptionHandlerMiddleware.Invoke(DownstreamContext context)
2020-07-20 11:46:01.3982||DEBUG|Ocelot.Errors.Middleware.ExceptionHandlerMiddleware|requestId: 0HM1CCO82S6AR:00000001, previousRequestId: no previous request id, message: ocelot pipeline finished

Ocelot : 13.5.2
Net Core: 2.2

Any help is appreciated..

[lufeiyuan83]

hi chaitanyaphanikumar
please update your Ocelot Configuration.json
{
"DownstreamPathTemplate": "/api/v1/identity/register",
"DownstreamScheme": "https",
"UseServiceDiscovery": true,
"ServiceName": "IdentityService",
"UpstreamPathTemplate": "/v1/identity/register",
"UpstreamHttpMethod": [ "POST" ],
"LoadBalancerOptions": {
"Type": "LeastConnection"
}
}
],
"GlobalConfiguration": {
"RequestIdKey": "OcRequestId",
"BaseUrl": "https://localhost:44311",
"ServiceDiscoveryProvider": {
"Scheme": "http",
"Host": "localhost",
"Port": 8500,
//////////////////////////////
"Type": "PollConsul"
//////////////////////////////
}
}

[raman-m]

@chaitanyaphanikumar Hi Chaitanya Phani Kumar!

Could you confirm, please, that @lufeiyuan83 advice helped to resolve the issue by changing provider type?

[raman-m]

The bug has been accepted due to open PR #1562