Client (browser) -> Spring Boot Gateway throgh ngrok ( -> http://localhost:8080) -> Spring Webflux APP (https://localhost:433)

Spring WebFlux app has a controller where a local redirect is performed:

@PostMapping("login-initiation")
Mono<RedirectView> loginInitiation(ServerWebExchange exchange, WebSession webSession) {
    ...
    return clientRegistrationEntityService.findByClientId(loginInitiationRequest.clientId())
        .map(clientRegistration -> new RedirectView("/oauth2/authorization/" + clientRegistration.getRegistrationId()));
});

I expect the absolute redirect path to be https://localhost:443/oauth2/authorization/,

but instead, the actual redirect path is /oauth2/authorization/.

What is the reason for using the gateway domain instead of localhost? How can I ensure that the redirect path is https://localhost:443/oauth2/authorization/

Client (browser) -> Spring Boot Gateway throgh ngrok (https://dfsdfs-sds-prawn.ngrok-free.app -> http://localhost:8080) -> Spring Webflux APP (https://localhost:433)

Spring WebFlux app has a controller where a local redirect is performed:

@PostMapping("login-initiation")
Mono<RedirectView> loginInitiation(ServerWebExchange exchange, WebSession webSession) {
    ...
    return clientRegistrationEntityService.findByClientId(loginInitiationRequest.clientId())
        .map(clientRegistration -> new RedirectView("/oauth2/authorization/" + clientRegistration.getRegistrationId()));
});

I expect the absolute redirect path to be https://localhost:443/oauth2/authorization/,

but instead, the actual redirect path is https://dfsdfs-sds-prawn.ngrok-free.app/oauth2/authorization/.

What is the reason for using the gateway domain instead of localhost? How can I ensure that the redirect path is https://localhost:443/oauth2/authorization/

• spring-boot
• http-redirect
• spring-webflux
• gateway
• ngrok

1 Answer 1

Try to set an absolute URL:

@PostMapping("login-initiation")
Mono<RedirectView> loginInitiation(ServerWebExchange exchange, WebSession webSession) {
    ...
    return clientRegistrationEntityService.findByClientId(loginInitiationRequest.clientId())
        .map(clientRegistration -> new RedirectView("https://localhost:433/oauth2/authorization/" + clientRegistration.getRegistrationId()));
});