Hello,
we're using ABP with multiple microservices. Because we build our microservices for multiple use-cases we want to group controllers into groups (for different clients) by Area attribute.
For example I have ServiceA where are some Controllers with [Area(nameof(ServiceA))] some with [Area(nameof(ServiceB))] and some with [Area(nameof(ServiceC))]. We're having:
[DependsOn(
typeof(ServiceAApplicationContractsModule),
typeof(AbpHttpClientModule))]
public class ServiceAHttpApiClientModule : AbpModule
{
public override void ConfigureServices(ServiceConfigurationContext context)
{
context.Services.AddStaticHttpClientProxies(
typeof(ServiceAApplicationContractsModule).Assembly,
"ServiceA");
}
}
That's works pretty fine. When I generate proxies with: abp generate-proxy -m ServiceA -t csharp -url https://localhost:44444/ --without-contracts.
We have a problem when from ServiceB I want to use generated proxies because in this setting I'm getting (when I inject IApplicationService from ServiceA in ServiceB that: The API description of the ServiceB.IServiceBAppService method was not found!. After some investigation I found out that if I change ApiClientModule this way:
[DependsOn(
typeof(ServiceAApplicationContractsModule),
typeof(AbpHttpClientModule))]
public class ServiceAHttpApiClientModule : AbpModule
{
public override void ConfigureServices(ServiceConfigurationContext context)
{
context.Services.AddStaticHttpClientProxies(
typeof(ServiceAApplicationContractsModule).Assembly,
"ServiceA");
context.Services.AddStaticHttpClientProxies(
typeof(ServiceAApplicationContractsModule).Assembly,
"ServiceB");
}
}
and generate proxies for both services. Everything starts to work fine
But this setup causes that ServiceB in some scenarios throws Exception that it tries to find definition RemoteServices for communication with ServiceB in appsettings.json what don't make sense. If I remove context.Services.AddStaticHttpClientProxies(typeof(ServiceAApplicationContractsModule).Assembly, "ServiceB"); this works fine but there is again problem with Method was not found.
Can you please tell we how we should correctly implement multiple Areas on Controllers?
Thank you!
2 Answer(s)
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0
To correctly implement multiple Areas for controllers and use static client proxies across microservices in ABP, you need to ensure that the static proxy generation and registration align with the remote service configuration and the way your controllers are grouped.
Key Points & Solution
Static Proxy Generation and Remote Service Names
- When you use
AddStaticHttpClientProxieswith a specific remote service name (e.g.,"ServiceA"or"ServiceB"), ABP expects a corresponding entry in yourappsettings.jsonunderRemoteServices. - If you register both
"ServiceA"and"ServiceB"in the same module, but only have a configuration for"ServiceA", ABP will throw an error when trying to resolve"ServiceB".
- When you use
Proxy Generation for Multiple Areas
- If your controllers are grouped by Area (e.g.,
[Area("ServiceA")],[Area("ServiceB")]), and you want to generate proxies for both, you must:- Register each area as a remote service in your client module.
- Ensure your
appsettings.json(or equivalent configuration) contains aRemoteServicesentry for each area you register.
Example
appsettings.json:- If your controllers are grouped by Area (e.g.,
"RemoteServices": { "ServiceA": { "BaseUrl": "https://localhost:44444/" }, "ServiceB": { "BaseUrl": "https://localhost:44444/" } }- Proxy Registration
- In your client module, register both:
context.Services.AddStaticHttpClientProxies( typeof(ServiceAApplicationContractsModule).Assembly, "ServiceA"); context.Services.AddStaticHttpClientProxies( typeof(ServiceAApplicationContractsModule).Assembly, "ServiceB");- This tells ABP to generate and register proxies for both areas, and the configuration ensures the correct endpoint is used.
- Proxy Generation Command
- When generating proxies, you should generate for each remote service:
abp generate-proxy -m ServiceA -t csharp -u https://localhost:44444/ --without-contracts abp generate-proxy -m ServiceB -t csharp -u https://localhost:44444/ --without-contracts- This ensures that the generated proxies are aware of the correct area and remote service.
- Avoiding Configuration Errors
- If you register a remote service (e.g.,
"ServiceB") but do not provide a configuration for it, ABP will throw an error at runtime. - Always ensure that every remote service name used in
AddStaticHttpClientProxieshas a corresponding entry in your configuration.
- If you register a remote service (e.g.,
Summary
- Register each Area as a separate remote service in both your client module and configuration.
- Generate proxies for each remote service.
- Ensure your configuration matches your proxy registrations.
This approach is required because ABP's static proxy system uses the remote service name to resolve endpoints and API descriptions, and each must be explicitly configured.
Sources:
- Static C# API Client Proxies
- ABP Issue: Static proxy generation with contracts
- ABP Static Client Proxies Documentation
This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.
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0
hi
Because we build our microservices for multiple use-cases we want to group controllers into groups (for different clients) by Area attribute.
Can you share an example controller code?
Thanks.
