To handle network failures during ABP module initialization in a MAUI Blazor Hybrid app (especially on Samsung devices with aggressive battery optimization), you should implement a more resilient initialization and error handling strategy. The ABP initialization process expects a successful remote configuration fetch; if the network is unavailable (as with Samsung's battery optimization), it will throw an exception and show a white screen.
Here are recommended approaches:
Graceful Network Failure Handling
MauiBlazorCachedApplicationConfigurationClient.InitializeAsync()) in a try-catch block.Defer or Skip Configuration Refresh
Connectivity.NetworkAccess to check network status.Example:
if (Connectivity.NetworkAccess == NetworkAccess.Internet)
{
await MauiBlazorCachedApplicationConfigurationClient.InitializeAsync();
}
else
{
// Show offline message or use cached data
}
Custom Error UI
Samsung Battery Optimization Guidance
Avoid Using "localhost" in Production
Unable to resolve host "localhost" suggests the app is trying to connect to a local server, which will not work on a physical device. Ensure your RemoteService:BaseUrl and OIDC Authority point to a reachable server, not localhost.Polly Integration
Reference: ABP Polly Integration
Session Persistence
By combining these strategies, you can provide a much better user experience and avoid white screens or crashes due to Samsung's battery optimization.
Sources:
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To implement a privacy-focused, tenant-aware registration and login flow in ABP Framework (v9.3, MVC, non-tiered), you can use the following approach:
Registration:
Login:
Implementation Example (Custom LoginModel):
public class CustomLoginModel : LoginModel
{
private readonly ITenantRepository _tenantRepository;
public CustomLoginModel(
IAuthenticationSchemeProvider schemeProvider,
IOptions<AbpAccountOptions> accountOptions,
IOptions<IdentityOptions> identityOptions,
ITenantRepository tenantRepository,
IdentityDynamicClaimsPrincipalContributorCache contributorCache)
: base(schemeProvider, accountOptions, identityOptions, contributorCache)
{
_tenantRepository = tenantRepository;
}
public override async Task<IActionResult> OnPostAsync(string action)
{
var matchingTenants = new List<(Guid? TenantId, IdentityUser User)>();
foreach (var tenant in await _tenantRepository.GetListAsync())
{
using (CurrentTenant.Change(tenant.Id))
{
var user = await UserManager.FindByNameAsync(LoginInput.UserNameOrEmailAddress) ??
await UserManager.FindByEmailAsync(LoginInput.UserNameOrEmailAddress);
if (user != null && await UserManager.CheckPasswordAsync(user, LoginInput.Password))
{
matchingTenants.Add((tenant.Id, user));
}
}
}
if (matchingTenants.Count == 1)
{
using (CurrentTenant.Change(matchingTenants[0].TenantId))
{
return await base.OnPostAsync(action);
}
}
else if (matchingTenants.Count > 1)
{
// Prompt user to select tenant (implement UI to show options)
// Store matchingTenants in TempData or session for next step
// Redirect to a tenant selection page
return RedirectToPage("./SelectTenant", new { /* pass necessary info */ });
}
// No match found
ModelState.AddModelError(string.Empty, "Invalid login attempt.");
return Page();
}
}
Notes:
Sources:
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Google reCAPTCHA v3 scores can be lower in local development environments, even if "localhost" is added to the allowed domains. This is a known behavior and is not specific to ABP. Google’s scoring algorithm may treat local traffic as less trustworthy, especially if requests are automated or lack real user interaction.
In production, real user activity and proper domain validation typically result in higher scores. For local development, you can consider lowering the score threshold in your ABP reCAPTCHA configuration to allow testing, but be sure to restore the recommended threshold for production.
To adjust the threshold in ABP, set the AbpReCaptchaOptions.ScoreThreshold to a lower value in your development environment:
Configure<AbpReCaptchaOptions>(options =>
{
options.ScoreThreshold = 0.1f; // Lower for local testing
});
Always use your actual site key and secret, and ensure you are not using test keys in production.
For more details on enabling and configuring reCAPTCHA in ABP, see the official support answer:
Google’s official documentation:
Sources:
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To resolve your ABP Commercial license visibility and validation issues, follow these steps:
Why you don’t see licenses under your account dashboard:
How to generate the correct license code/API key:
AbpLicenseCode (not the NuGet API key) in your application's configuration (e.g., appsettings.json or as an environment variable).nuget.config is only for downloading packages, not for runtime license validation.AbpLicenseCode:
AbpLicenseCode and add it to your application's configuration.Fixing ABP-LIC-0017 and license validation errors:
AbpLicenseCode.appsettings.json (or as an environment variable), set:"AbpLicenseCode": "<your-copied-license-code>"
abp logout
abp login <your-username> -p <your-password> -o <your-organization>
AbpLicenseCode entries in your solution with the new code from your commercial license.https://nuget.abp.io/ and the API key is correct for package restore.Following these steps should resolve both the license visibility and validation errors.
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To implement impersonation (LoginAsThisUser) from your custom tenants or users page in an ABP-based Angular application, you should use the built-in impersonation API provided by the ABP Account Module. This is the same mechanism used in the default Users and Tenants management pages.
Here’s how you can achieve this:
Enable Impersonation Permissions
AbpIdentity.Users.Impersonation for user impersonation and Saas.Tenants.Impersonation for tenant impersonation.Call the Impersonation API
POST /api/account/impersonationPOST /api/account/impersonation/tenantRedirect to the Impersonation URL
Example (User Impersonation in Angular):
// In your Angular service/component
this.http.post<{ url: string }>(
'/api/account/impersonation',
{ userId: targetUserId, tenantId: targetTenantId } // tenantId is optional
).subscribe(response => {
window.location.href = response.url; // Redirect to impersonation URL
});
Example (Tenant Impersonation in Angular):
this.http.post<{ url: string }>(
'/api/account/impersonation/tenant',
{ tenantId: targetTenantId }
).subscribe(response => {
window.location.href = response.url;
});
Note:
Sources:
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The limitation you are observing—where only 5 simultaneous HTTP requests are made from Blazor WebAssembly—is not imposed by ABP Framework or any ABP module. Instead, this is a browser-level restriction. Most browsers limit the number of concurrent HTTP/HTTPS connections per host (typically 5 or 6) to optimize network performance and resource usage.
This behavior is not configurable via ABP modules or static client proxy settings. It is determined by the browser's networking stack and cannot be changed from your Blazor or ABP code.
If you need to optimize or control the number of concurrent requests, you would need to implement your own request throttling or queuing logic in your Blazor application.
For more information about static C# client proxies in ABP, see the official documentation:
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To customize or secure the api/abp/application-configuration endpoint in ABP Framework, here are the key points:
Override the Controller or AppService:
AbpApplicationConfigurationController or the underlying AbpApplicationConfigurationAppService to filter out or secure specific data.[Authorize] attribute to require authentication, or selectively remove properties from the response.Example (override controller and add authorization):
[Authorize] // Require authentication
public class MyApplicationConfigurationController : AbpApplicationConfigurationController
{
public MyApplicationConfigurationController(
IAbpApplicationConfigurationAppService appService
) : base(appService)
{
}
// Optionally override methods to filter response data
}
Potential Impact:
Best Practice:
This approach is supported by ABP's extensibility model, but you must carefully test your frontend to avoid breaking user experience.
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Hangfire 后台任务在调用其他微服务 API 时遇到 403 Forbidden，通常是因为没有携带有效的认证/授权信息（如 Access Token），导致目标 API 拒绝访问。
解决方案如下：
建议不要直接在 Hangfire 任务中调用需要授权的 Application Service。可以将业务逻辑提取到 Domain Service，在 Application Service 和 Hangfire Job 中分别调用 Domain Service，这样 Domain Service 不需要授权即可执行核心逻辑。
如果必须通过 HTTP 调用其他微服务的 API，需要在 Hangfire 任务中手动获取并设置有效的 Access Token。常见做法是：
伪代码示例：
// 获取 Token
var token = await tokenProvider.GetTokenAsync();
// 设置 Token 到请求头
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
// 调用 API
var result = await client.GetAsync("https://api-service/your-api");
总结：Hangfire 任务本身没有用户上下文，不能自动获得权限。推荐用 Domain Service 分离业务逻辑，或在 Job 里用 Client Credentials 获取 Token 后再调用 API。
参考文档已验证可访问。
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JsonObjectCreationHandling.Populate is incompatible with reference handling occurs when System.Text.Json serialization options are misconfigured, often due to incompatible settings between ABP's distributed cache and the .NET JSON serializer. This typically happens after upgrading .NET or ABP versions, or when using distributed cache (e.g., Redis) with cached objects that have reference loops or require special handling.To resolve this in ABP 9.x:
Check Distributed Cache Configuration
JsonSerializerOptions, remove or update them to avoid setting both ReferenceHandler and JsonObjectCreationHandling.Populate.Clear Existing Cache
Update ABP and .NET Packages
Review Custom Serialization Code
AbpSystemTextJsonSerializer, ensure you do not set both ReferenceHandler and JsonObjectCreationHandling.Populate in your JsonSerializerOptions.Example: Correct Cache Serializer Configuration
Configure<AbpSystemTextJsonSerializerOptions>(options =>
{
options.JsonSerializerOptions.ReferenceHandler = null; // or ReferenceHandler.Preserve if needed, but not with Populate
// Do not set JsonObjectCreationHandling.Populate
});
For more details, see:
If the problem persists, ensure all microservices or app instances use the same ABP and .NET versions and cache configuration.
Sources:
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abp new Acme.BookStore -t microservice -u angular --database-provider postgresql
This template includes .NET 8, Angular, PostgreSQL, Redis, and Docker support.
docker-compose.yml for all services (API Gateway, IdentityServer, microservices, Angular UI, PostgreSQL, Redis). After generating the solution, check the /docker folder and root docker-compose.yml. You can run all services with:docker compose up --build
Make sure your docker-compose.yml exposes ports for API Gateway, IdentityServer, and Angular UI (e.g., 44300, 44301, 4200).
docker-compose.override.yml and each service’s Dockerfile. For PostgreSQL and Redis, use service names as hostnames (e.g., Host=postgres; for PostgreSQL, Configuration=redis:6379 for Redis). ABP microservice templates use environment variables like ConnectionStrings__Default and Redis__Configuration for configuration. Example:environment:
- ConnectionStrings__Default=Host=postgres;Port=5432;Database=abp;User Id=postgres;Password=yourpassword
- Redis__Configuration=redis:6379
All containers are on the same Docker network, so use service names (not localhost) for inter-service communication.
localhost:<exposed-port>..env files for secrets and environment-specific overrides.If you have issues accessing services on localhost, ensure ports are published in docker-compose.yml and not blocked by firewalls. For WSL2, Docker’s networking is compatible with localhost access.
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