- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Connection Guide
- API Documentation
- FAQs
- Service Protocol
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Connection Guide
- API Documentation
- FAQs
- Service Protocol
The Aegis instance of RUM automatically monitors exceptions such as JavaScript and Promise execution errors and Ajax (fetch) request exceptions. This document describes the monitoring logic of each error type and how to handle them.
Note:
The Aegis instance monitors such exceptions. If you only import the Aegis SDK but don't instantiate it, it won't report any data.
JavaScript Execution Error
Aegis listens on the
onerror event in the window object to capture project errors. Then, it parses errors and analyze the heaps and stacks to automatically report the error information to the backend service. In this case, the report level is error; therefore, when the number of automatically reported errors reaches the threshold, Aegis will automatically trigger an alarm to help you find the exceptions promptly. As the report level is error, automatic reporting will also affect the project score.If a cross-origin JavaScript script is imported on the page, you need to add the
crossorigin attribute to the script tag; otherwise, Aegis cannot get the error details.If the user uses the Vue framework, import the following code to get and actively report errors:
Vue.config.errorHandler = function(err, vm, info) {console.log(`Error: ${err.toString()}\\nStack: ${err.stack}\\nInfo: ${info}`);aegis.error(`Error: ${err.toString()}\\nStack: ${err.stack}\\nInfo: ${info}`);};
Promise Execution Error
RUM listens on the
unhandledrejection event to capture Promise errors that are not caught through catch. To ensure page stability, we recommend you catch all Promise errors.Ajax (fetch) Request Exception
Aegis rewrites the
XMLHttpRequest object to listen on each API request and will consider the following cases an exception: http status is greater than or equal to 400.A request times out or is aborted, cross-origin, or canceled.
http status is still 0 when a request ends, which usually occurs when the request fails.Note:
When an error occurs, the Aegis SDK doesn't actively collect API request and response parameters. If you want such API information to be reported, you can use the
apiDetail API parameter to enable reporting.new Aegis({api: {apiDetail: true,},});
retcode Exception
Aegis rewrites the
XMLHttpRequest object to get the API response. It also tries to get the retcode of the request in the response. If the retcode doesn't meet the expectation, the request will be considered exceptional and will be reported.Note:
Resource Loading Failure
If a request sent by a page element fails, it will be captured by the
window.onerror event. Aegis uses this feature to listen on the loading failures of following resources: CSS and font requested by the
<link> tag.Scripts requested by the
<script> tag.Multimedia resources requested by the
<audio> and <video> tags.
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