I have the following setup:
Custom Domain api.foo.co.uk-> API Mapping to stage v1 -> HTTP API path ANY /{proxy+} -> Private VPC Link -> ALB Fargate
If I hit the Custom Domain api.foo.co.uk I get a 503 "message": "Service Unavailable"
If I hit the API direct p3dqjsdfszlv7.execute-api.eu-west-1.amazonaws.com/v1/ I get the same
In the CW for the API I see the following:
{
"auth_status":"-",
"aws_endpoint":"-",
"cognito_auth_provider":"-",
"cognito_auth_type":"-",
"cognito_identity_id":"-",
"cognito_identity_pool_id":"-",
"domain_name":"api.foo.co.uk",
"domain_prefix":"api",
"err_msg":"Service Unavailable",
"err_response":"INTEGRATION_NETWORK_FAILURE",
"err_string":" "Service Unavailable"",
"http_method":"GET",
"integration_error":"-",
"integration_error_msg":"-",
"integration_int_status":"200",
"integration_status":"-",
"path":"/v1/",
"principa_ord_id":"-",
"protocol":"HTTP/1.1",
"request_id":"cSJJ2h7BjoEEJ-g=",
"route_key":"ANY /{proxy+}",
"source_ip":"22.22.103.68",
"stage":"v1",
"status":"503",
"time":"16/Mar/2021:14:08:24 +0000",
"user":"-",
"user_agent":"insomnia/2021.1.0"}
Anyone have any idea what the issue might be ? I have looked and can not find anything on the error message err_response":"INTEGRATION_NETWORK_FAILURE" or what the cause might be.
I have also enabled the access logs on the ALB but they are blank so I am assuming its not getting as far as the ALB
This might be the root cause of the 503 errors. VPC links require to use private subnets. If I put public subnets along with the private subnets it returns 503 errors most of the time. After removing public subnets from the VPC Link it is fixed.
https://repost.aws/questions/QUR19Keq0OQ_qPin1MOBbvzA/http-api-alb-integration-5xx-errors