Hope redirection can be routed

[cqkisyouq]

I want to have a routing configuration for a redirected address.

[TomPallister]

@cqkisyouq Do you mean you want your routing to follow redirects?

If so in configuration.json there is a property on the ReRoute called HttpHandlerOptions and that has a property called AllowAutoRedirect.

If you set this to true Ocelot should follow redirects.

[cqkisyouq]

@TomPallister No,I want to use the route to control the address for redirection

[cqkisyouq]

Current redirection addresses are not controlled by routing

[TomPallister]

Ahhh you want to return a 301 or 302 from Ocelot?

[cqkisyouq]

@TomPallister Both return and non return can be available, but the address of the jump needs to be replaced on the specified route.

[cqkisyouq]

headers->location: localhost:5000/a/b
(replace)->return replace a new url or find request to result for Reroutes

[TomPallister]

@cqkisyouq I'm sorry but I don't understand what you want Ocelot to do :(

Please could you try and explain with more detail?

Thank you :o

[dbarkwell]

@cqkisyouq are you looking for the configuration to be updated for a 301?

[cqkisyouq]

@dbarkwell Yes, I want to configure the jump address because the present jump address is not controlled.

[cqkisyouq]

@TomPallister The absolute address is not controlled for ocelot, and the relative address is normal.
{
"DownstreamPathTemplate": "/pay/{url}",
"DownstreamScheme": "http",
"DownstreamHost": "localhost",
"DownstreamPort": "6773",
"UpstreamPathTemplate": "/pay/{url}",
"QosOptions": {
"ExceptionsAllowedBeforeBreasking": 3,
"DurationOfBreak": 10,
"TimeoutValue": 5000
}
}

response state 302
Date: Mon, 08 Jan 2018 02:25:05 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 145
Location: http://localhost:6773/pay/Recive

return Redirect("http://localhost:6773/pay/Recive");
Now redirection to http://localhost:6773/pay/Recive not controlled for ocelot

return RedirectToAction("Recive");
Location: /pay/Recive
Now redirection to http://localhost:5000/pay/Recive it's ok

[TomPallister]

@cqkisyouq I think I might understand now.

You have a service that is returning a redirect but the base url returned in the location header is for the service not Ocelot?

This is not a feature that Ocelot supports at the moment.

The easiest way for you to make this work is probably add a piece of middleware before ocelot that does a replace on your url.

redirectmiddleware.cs

public ReDirectMiddleware(RequestDelegate next         
{
      _next = next;        
}

public async Task Invoke(HttpContext context)
{
      await _next.Invoke(context);
      var locations = context.Response.Headers.FirstOrDefault(x => x.Key.ToLower() == "location");
      //do something with header
      //not sure exactly what but you should be able to transform the response header here.
}

startup.cs

app.RedirectMiddleware();
app.UseOcelot().Wait();

If I am correct this is a feature I will add soon.

[cqkisyouq]

@TomPallister Yes, you're right. That's the function I want.

[cqkisyouq]

@TomPallister It's so fast to see the realization of this function. Thank you very much for your efforts. Now is a one to one replacement, hoping to be optimized to be a multi - to - many replacement

"DownstreamHeaderTransform": {
"location": "http://localhost:5001,http://localhost:5000"
},

Hope to optimize the configuration：
"DownstreamHeaderTransform": {
"location": [{one,one},{two,two}....]
},
Now the function is already very good.

[TomPallister]

haha I will open another issue :)

[TomPallister]

@cqkisyouq #205

This should help with your location redirect use case but is not multi to many replacement yet!