Custom Instrumentation for Requests Module

Learn how to manually instrument your code to use Sentry's Requests module.

As a prerequisite to setting up Requests, you’ll need to first set up performance monitoring. Once this is done, the JavaScript SDK will automatically instrument outgoing HTTP requests. If that doesn't fit your use case, you can set up using custom instrumentation.

For detailed information about which data can be set, see the Requests Module developer specifications.

Once this is done, Sentry's Angular SDK captures all unhandled exceptions and transactions.

main.ts
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import {enableProdMode} from '@angular/core';
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import * as Sentry from '@sentry/angular';
import {AppModule} from './app/app.module';

Sentry.init({
  dsn: 'https://examplePublicKey@o0.ingest.sentry.io/0',
  integrations: [
    // Registers and configures the Tracing integration,
    // which automatically instruments your application to monitor its
    // performance, including custom Angular routing instrumentation
    Sentry.browserTracingIntegration(),
    // Registers the Replay integration,
    // which automatically captures Session Replays
    Sentry.replayIntegration(),
  ],

  // Set tracesSampleRate to 1.0 to capture 100%
  // of transactions for performance monitoring.
  // We recommend adjusting this value in production
  tracesSampleRate: 1.0,

  // Set `tracePropagationTargets` to control for which URLs distributed tracing should be enabled
  tracePropagationTargets: ['localhost', /^https:\/\/yourserver\.io\/api/],

  // Capture Replay for 10% of all sessions,
  // plus for 100% of sessions with an error
  replaysSessionSampleRate: 0.1,
  replaysOnErrorSampleRate: 1.0,
});

platformBrowserDynamic()
  .bootstrapModule(AppModule)
  .catch(err => console.error(err));

The Sentry Angular SDK exports a couple of Angular providers that are necessary to fully instrument your application. We recommend registering them in your main AppModule:

app.module.ts
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import {APP_INITIALIZER, ErrorHandler, NgModule} from '@angular/core';
import {Router} from '@angular/router';

import * as Sentry from '@sentry/angular';

@NgModule({
  // ...
  providers: [
    {
      provide: ErrorHandler,
      useValue: Sentry.createErrorHandler(),
    },
    {
      provide: Sentry.TraceService,
      deps: [Router],
    },
    {
      provide: APP_INITIALIZER,
      useFactory: () => () => {},
      deps: [Sentry.TraceService],
      multi: true,
    },
  ],
  // ...
})
export class AppModule {}

The Sentry.createErrorHandler function initializes a Sentry-specific ErrorHandler that automatically sends errors caught by Angular to Sentry. You can also customize the behavior by setting a couple of handler options.

The Sentry.TraceService listens to the Angular router for performance monitoring and tracing. To inject TraceService, register the APP_INITIALIZER provider as shown above. Alternatively, you can also require the TraceService from inside your AppModule constructor:

app.module.ts
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@NgModule({
  // ...
})
export class AppModule {
  constructor(trace: Sentry.TraceService) {}
}

NOTE: Refer to HTTP Span Data Conventions for a full list of the span data attributes.

Here is an example of an instrumented function that makes HTTP requests:

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async function makeRequest(method, url) {
  return await Sentry.startSpan(
    {op: 'http.client', name: `${method} ${url}`},
    async span => {
      const parsedURL = new URL(url, location.origin);

      const response = await fetch(url, {
        method,
      });

      span?.setAttribute('http.request.method', method);

      span?.setAttribute('server.address', parsedURL.hostname);
      span?.setAttribute('server.port', parsedURL.port || undefined);

      span?.setAttribute('http.response.status_code', response.status);
      span?.setAttribute(
        'http.response_content_length',
        Number(response.headers.get('content-length'))
      );

      // A good place to set other span attributes

      return response;
    }
  );
}
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