overview.md

title	description	author	ms.author	ms.date	ms.topic
How-to guides	How-to guides for Dev Proxy	garrytrinder	garrytrinder	04/02/2025	overview

How-to guides for Dev Proxy

• Get help and support

Intercept requests

• Discover URLs to watch
• Intercept requests from specific processes
• Intercept requests with specific headers
• Intercept requests to localhost
• Exclude a URL
• Inspect requests and responses using Chrome DevTool
• Inspect API requests issued by cloud services

Mock responses

• Mock responses
• Mock n-th request
• Mock responses that return binary data
• Mock multiple responses to the same endpoint
• Change mocks file
• Simulate a CRUD API
• Simulate a CRUD API across the internet
• Simulate a CRUD API secured with Microsoft Entra
• Simulate Azure OpenAI API
• Simulate OpenAI API
• Mock Teams Admin Center notification for Microsoft Graph connectors

Simulate errors

• Test my app with random errors
• Simulate errors from OpenAI APIs
• Simulate errors from Microsoft Graph APIs
• Change request failure rate

Simulate behaviors

• Test that my application handles throttling properly
• Simulate throttling on Microsoft 365 APIs
• Simulate Rate-Limit API responses
• Simulate slow API responses

Minimal permissions

• Detect minimal Microsoft Graph API permissions
• Check if you're using excessive Microsoft Graph API permissions

Record

• Record and export proxy activity

Improve my app

• Check if my app is using production-level APIs
• Check if my app is calling APIs with minimal permissions
• Find shadow APIs
• Generate an OpenAPI spec
• Update my application code to use Microsoft Graph JavaScript SDK

Presets

• Use preset configurations

Change settings

• Change logging level
• Clear the output
• Use local language model with Dev Proxy
• Refresh local Microsoft Graph database

Use Dev Proxy

• In a Docker container
• With Node.js applications
• With Node.js applications in Docker containers
• With JavaScript Azure Functions
• With .NET applications
• With .NET applications in Docker containers
• With .NET Aspire applications
• With SharePoint Framework (SPFx) solutions
• In CI/CD scenarios

Common problems

• No requests are intercepted
• No random errors are thrown when using mocks
• No internet connection after using the proxy
• All requests fail with 429 responses
• All requests fail with gateway time-out
• Binary responses aren't mocked
• No requests are intercepted from my .NET 4.8 app
• Options aren't recognized
• The type initializer for 'Microsoft.Data.Sqlite.SqliteConnection' threw an exception
• Uninstall
• Get help and support