I am currently using Krakend (https://krakend.io) API Gateway to proxy request to my backend service. One of my backend service API response is a redirect response with http 303. The redirect response looks like this below:
HTTP/1.1 303 See Other
content-length: 48
content-type: text/plain; charset=utf-8
date: Thu, 16 Jul 2020 10:25:41 GMT
location: https://www.detik.com/
vary: Accept
x-powered-by: Express
x-envoy-upstream-service-time: 17
server: istio-envoy
The problem is that, instead of returning the http 303 response to client (with location response header) as-is, Krakend is actually following the http redirect and return the response of the redirect Url, which is the html response of https://www.detik.com/.
My current krakend configuration looks like this below :
{
"version": 2,
"extra_config": {
"github_com/devopsfaith/krakend-cors": {
"allow_origins": [],
"expose_headers": [
"Content-Length",
"Content-Type",
"Location"
],
"allow_headers": [
"Content-Type",
"Origin",
"X-Requested-With",
"Accept",
"Authorization",
"secret",
"Host"
],
"max_age": "12h",
"allow_methods": [
"GET",
"POST",
"PUT"
]
},
"github_com/devopsfaith/krakend-gologging": {
"level": "ERROR",
"prefix": "[GATEWAY]",
"syslog": false,
"stdout": true,
"format": "default"
},
"github_com/devopsfaith/krakend-logstash": {
"enabled": false
}
},
"timeout": "10000ms",
"cache_ttl": "300s",
"output_encoding": "json",
"name": "api-gateway",
"port": 8080,
"endpoints": [
{
"endpoint": "/ramatestredirect",
"method": "GET",
"extra_config": {},
"output_encoding": "no-op",
"concurrent_calls": 1,
"backend": [
{
"url_pattern": "/",
"encoding": "no-op",
"sd": "static",
"extra_config": {},
"method": "GET",
"host": [
"http://ramatestredirect.default.svc.cluster.local"
],
"disable_host_sanitize": false
}
]
}
]
}
So how can I make krakend to return original http 303 response unaltered from my backend service to the client ?
i faced the same problem while working on google authentication, the api gateway was not redirecting the client to google login website instead fetching the html response of the url and sending it to the client: https://www.krakend.io/docs/enterprise/backends/client-redirect/
the solution is to tell your browser that there is a redirection from server :
return res.status(300).header('Location', yourUrl).send('Redirecting to...');