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feat(javascript): Add documentation for injecting Html <meta> tags #10926

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Aug 14, 2024
Merged

feat(javascript): Add documentation for injecting Html <meta> tags #10926

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8737c61
feat(node): Add documentation for `getMetaTagValues` function
Lms24 Jul 31, 2024
a3ebd81
slight wording adjustment
Lms24 Jul 31, 2024
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Apply suggestions from code review
Lms24 Aug 6, 2024
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Update platform-includes/distributed-tracing/custom-instrumentation/j…
Lms24 Aug 6, 2024
483def4
update for new APIs
Lms24 Aug 6, 2024
c750e4e
supporter->notSupported
Lms24 Aug 6, 2024
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39 changes: 38 additions & 1 deletion platform-includes/distributed-tracing/custom-instrumentation/javascript.mdx
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Expand Up @@ -169,7 +169,7 @@ In this example, we create a new transaction that is attached to the trace speci

</PlatformCategorySection>

### Inject Tracing Information to Outgoing Requests
### Inject Tracing Information into Outgoing Requests

For distributed tracing to work, the two headers that you extracted and stored in the active root span, `sentry-trace` and `baggage`, must be added to outgoing HTTP requests.

Expand Down Expand Up @@ -205,6 +205,43 @@ In this example, tracing information is propagated to the project running at `ht

The two services are now connected with your custom distributed tracing implementation.

<PlatformCategorySection supported={['server', 'serverless']}>

### Injecting Tracing Information into HTML

If you're server-side rendering HTML and you use a Sentry SDK in your browser application, you can connect the backend and frontend traces by injecting your server's tracing information `<meta>` tags into the HTML that's initially served to the client. When the frontend SDK is initialized, it will automatically pick up the tracing information from the `<meta>` tags and continue the trace. Note, that your browser SDK needs to register `browserTracingIntegration` for this to work.
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```javascript
function renderHtml() {
const metaTagValues = Sentry.getMetaTagValues(
Sentry.getCurrentScope(),
Sentry.getActiveSpan(),
Sentry.getClient()
);

return `
<html>
<head>
<meta name="sentry-trace" content="${metaTagValues["sentry-trace"]}">
<meta name="baggage" content="${metaTagValues.baggage}">
</head>
<body>
<!-- Your HTML content -->
</body>
</html>
`;
}
```

<Note>

This setup is only required if you have a custom SSR or HTML page generation setup.
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Can we avoid showing this note, and simply only show this whole section for relevant SDKs? So hide it for next, remix etc?

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Yeah let's try this first. We can always expand the allowlist if users are asking for it.

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Ok, updated to notSupported=['browser'] which makes this section also dissappear for meta framework SDKs

c750e4e

If you're using a meta framework like Next.js, the respective Sentry SDK already takes care of setting the tracing information automatically.

</Note>

</PlatformCategorySection>

### Starting a New Trace

Available since SDK version `8.5.0`.
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