bcquality/microsoft/knowledge/security/secretstrsubstno-for-composing-secrets.md
Jesper Schulz-Wedde 2b5550c346
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Improve partner onboarding and documentation navigation (#174)
Lead with a complete plugin quick start and add task-oriented usage, troubleshooting, customization, and contribution guides. Preserve the broader plugin framing, correct conflicting contract guidance, support Agents folder reviews, and align repository validation. Convert existing sample references to clickable links without changing knowledge rules.

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
2026-09-09 17:31:03 +02:00

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---
bc-version: [23..]
domain: security
keywords: [secretstrsubstno, secrettext, strsubstno, format, compose]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Use SecretStrSubstNo to compose strings that contain secrets
## Description
`SecretStrSubstNo` is the secret-preserving counterpart of `StrSubstNo`. It inserts `SecretText` arguments into `%1`, `%2`, and similar placeholders and returns `SecretText` without materializing the result as plain text. It is the right tool for values such as a `Token %1` authorization header or a URI with an API key placeholder.
## Best Practice
Compose every secret-bearing string through `SecretStrSubstNo`, ensure the format contains a placeholder for each secret, and keep the result as `SecretText`. Pass it to `HttpRequestMessage.SetSecretRequestUri`, `HttpHeaders.Add`, or `HttpContent.WriteFrom`. See sample: [`secretstrsubstno-for-composing-secrets.good.al`](secretstrsubstno-for-composing-secrets.good.al).
## Anti Pattern
Keeping a credential in `Text` and inserting it with `StrSubstNo`, or calling `SecretStrSubstNo` with a format that has no placeholder for the secret. The first exposes the value as plain text; the second silently omits it. See sample: [`secretstrsubstno-for-composing-secrets.bad.al`](secretstrsubstno-for-composing-secrets.bad.al).