ASP.NET Core 7.0 Minimal Web API with Ocelot as API gateway redirects to downstream service

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ASP.NET Core 7.0 Minimal Web API with Ocelot as API gateway redirects to downstream service

Hamed Vaziri 136

I have an ASP.NET Core 7.0 Minimal Web API with Ocelot as API gateway. I've uploaded it to my production server and use this configuration in ocelot.json config file:

{
    "GlobalConfiguration": {
        "BaseUrl": "https://api.mySite.com"
    },
    "Routes": [
        {
            "UpstreamPathTemplate": "/sync/info",
            "UpstreamHttpMethod": [ "Get" ],
            "DownstreamPathTemplate": "/info",
            "DownstreamScheme": "http",
            "DownstreamHostAndPorts": [
                {
                    "Host": "sync.mySite.com",
                    "Port": 80
                }
            ]
        }
    ]
}

The problem is that when I send a request to the https://api.mySite.com/sync/info URL, it redirects to https://sync.mySite.com/info in my browser and displays the result.

First question: is this true? How to prevent to redirection when request my API via API gateway (I've also removed the line app.UseHttpsRedirection() from program.cs class of my API gateway project and re-published to production server, but still facing the same result)?

Second question: if I changed downstreamScheme to https, I am facing an http 502 (bad gateway) status code, while when I request downstream service directly via https, it works correctly. Where is the problem and how to solve it?

Thanks in advance

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Answer 1

Bruce (SqlWork.com) 77,686 Volunteer Moderator

We can’t see you code so we don’t know why it redirects. Typically a web api would not redirect, only return status codes.

did you change the port number when you changed the protocol?

Hamed Vaziri 136 Reputation points

2023-09-18T15:20:04.3+00:00

Yes it works!!

For the second problem, i've changed port number to 443 when use https scheme for downstream service.

But for the first problem, How to prevent to redirection to original service url?

Thanks in advance

Hamed Vaziri 136

We can’t see you code so we don’t know why it redirects. Typically a web api would not redirect, only return status codes.

Here is my whole code in api gateWay project :

using Ocelot.DependencyInjection;
using Ocelot.Middleware;
using Ocelot.Cache.CacheManager;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Configuration.AddJsonFile("ocelot.json", optional: false, reloadOnChange: true);
builder.Services.AddOcelot(builder.Configuration)
	.AddCacheManager(x =>
	 {
		 x.WithDictionaryHandle();
	 });

var app = builder.Build();

//app.UseHttpsRedirection();
await app.UseOcelot();

app.Run();

Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator

2023-09-18T17:40:25.07+00:00

it's your webapi app that redirecting. also you appear to not have configured your site for proxy headers:

https://learn.microsoft.com/en-us/aspnet/core/host-and-deploy/proxy-load-balancer?view=aspnetcore-7.0

Answer 2

Hamed Vaziri 136

Yes, It works!!

First problem : Change port number to 443 when use https for your downstream service!

Second problem : Use app.UseHttpsRedirection() in your api gateWay project and re-publish to your server. Remember, Clear your browser cache when you call your endPoint!!!

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ASP.NET Core 7.0 Minimal Web API with Ocelot as API gateway redirects to downstream service

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