7071.md
root@localhost:~# cat 7071.md

Localhost:7071 Development Port

# 定义

Port 7071 is specifically designated for Azure Functions runtime host during local development. This port choice ensures no conflicts with common web development ports while being within the user-accessible range. The Azure Functions Core Tools use this port to simulate the Azure Functions runtime environment locally, enabling developers to test HTTP triggers, timer functions, and other serverless components before cloud deployment.

# Services and Software That Use Port 7071

## Development Tools

• Azure Functions Core Tools
Primary development tool for creating, testing, and debugging Azure Functions locally on port 7071.
• Azure Functions Extension
VS Code extension that integrates with Core Tools to provide enhanced development experience.
• Azure CLI Functions
Command-line interface for managing Azure Functions that can interact with local development server.
• Postman/Thunder Client
API testing tools commonly used to test HTTP-triggered functions running on localhost:7071.

## Development Frameworks

• Azure Functions Runtime
Local runtime environment that simulates Azure Functions execution environment.
• .NET Azure Functions
C# and F# Azure Functions running in local development mode on port 7071.
• Node.js Azure Functions
JavaScript and TypeScript Azure Functions executed locally through Core Tools.
• Python Azure Functions
Python-based Azure Functions running in local development environment.

## Application Servers

• Function Host
The core host process that manages function execution and HTTP routing locally.
• Binding Extensions
Various Azure service bindings (Cosmos DB, Service Bus, etc.) running in local mode.
• Trigger Simulators
Local simulation of Azure triggers like HTTP, Timer, and Queue triggers.

## Other Tools

• Azurite
Azure Storage emulator that often works alongside Functions Core Tools for local testing.
• Local API Gateways
Custom routing and proxy services that interact with local Azure Functions.
• Function Orchestrators
Durable Functions orchestrators running in local development mode.

# Frequently Asked Questions

Q: What are Azure Functions Core Tools and why port 7071?

A:

Azure Functions Core Tools are command-line tools for developing and testing Azure Functions locally. Port 7071 is the default port to avoid conflicts with common development ports while providing a dedicated endpoint for serverless function testing.

Q: Which programming languages are supported for local development?

A:

Azure Functions Core Tools support C#, JavaScript, TypeScript, Python, Java, and PowerShell. Each language has specific requirements and runtime dependencies that must be installed locally.

Q: Can I change the default port from 7071?

A:

Yes, you can specify a different port using the --port flag when running 'func start --port 8080'. You can also set the port in your launch configuration for debugging in VS Code.

Q: What is local.settings.json and why is it important?

A:

local.settings.json contains local development configuration including app settings, connection strings, and runtime settings. It's crucial for running functions locally but should never be committed to source control.

Q: How do I debug Azure Functions running on localhost:7071?

A:

You can debug using VS Code with the Azure Functions extension, Visual Studio with Azure development workload, or attach external debuggers. The func start command supports debugging for most languages.

Q: What are binding extensions and when do I need them?

A:

Binding extensions enable Azure Functions to integrate with Azure services like Cosmos DB, Service Bus, etc. Install them with 'func extensions install' when your functions use non-HTTP triggers or bindings.

Q: How do I deploy functions tested locally to Azure?

A:

Use 'func azure functionapp publish [app-name]' to deploy your function app to Azure. Ensure your Azure Function App is created and properly configured before deployment.

Q: Can I performance test functions running on localhost:7071?

A:

Yes, you can use tools like Artillery, Apache Bench, or Postman to performance test local functions. However, local performance may differ significantly from Azure cloud performance.

# How to Use Port 7071

1.

Install Azure Functions Core Tools

Install Azure Functions Core Tools using npm, chocolatey, or direct download. Verify installation with version check.

bash
npm install -g azure-functions-core-tools@4 --unsafe-perm true
2.

Create Function Project

Initialize a new Azure Functions project in your preferred language (C#, JavaScript, Python, etc.) using the func init command.

bash
func init MyFunctionApp --worker-runtime node
3.

Add Function to Project

Create a new function within your project using func new command. Choose from various templates like HTTP trigger, Timer trigger, etc.

bash
func new --name HttpExample --template "HTTP trigger"
4.

Start Local Development Server

Run the function app locally using func start. The server will start on port 7071 and display available function endpoints.

bash
func start
5.

Test Functions Locally

Access your HTTP-triggered functions at http://localhost:7071/api/[function-name] or use the Azure Functions extension in VS Code for debugging.

bash
curl http://localhost:7071/api/HttpExample?name=World

# Common Problems

## MEDIUM Severity Issues

⚠ Port 7071 already in use

Another process is using port 7071, preventing Azure Functions Core Tools from starting the local development server.

⚠ Binding extension errors

Missing or incompatible binding extensions cause functions to fail during local execution.

⚠ Local settings configuration missing

Missing or incorrect local.settings.json file causes configuration and connection string issues.

## HIGH Severity Issues

⚠ Function runtime not found

Azure Functions Core Tools cannot locate the appropriate runtime version or language worker for the project.

## LOW Severity Issues

⚠ CORS issues during testing

Cross-origin requests from web applications to localhost:7071 are blocked due to CORS policy restrictions.

# Troubleshooting Solutions

## Windows Platform

Resolve Port 7071 Conflicts

For: port_conflict

Steps:

  1. Identify which process is using port 7071
  2. Stop the conflicting process or kill it if necessary
  3. Alternatively, configure Azure Functions Core Tools to use a different port
  4. Restart the func start command
  5. Update any client applications to use the new port if changed
windows
netstat -ano | findstr :7071

## macOS Platform

Resolve Port 7071 Conflicts

For: port_conflict

Steps:

  1. Identify which process is using port 7071
  2. Stop the conflicting process or kill it if necessary
  3. Alternatively, configure Azure Functions Core Tools to use a different port
  4. Restart the func start command
  5. Update any client applications to use the new port if changed
macos
lsof -i :7071

## Linux Platform

Resolve Port 7071 Conflicts

For: port_conflict

Steps:

  1. Identify which process is using port 7071
  2. Stop the conflicting process or kill it if necessary
  3. Alternatively, configure Azure Functions Core Tools to use a different port
  4. Restart the func start command
  5. Update any client applications to use the new port if changed
linux
sudo netstat -tlnp | grep :7071

## All Platform

Resolve Port 7071 Conflicts

For: port_conflict

Steps:

  1. Identify which process is using port 7071
  2. Stop the conflicting process or kill it if necessary
  3. Alternatively, configure Azure Functions Core Tools to use a different port
  4. Restart the func start command
  5. Update any client applications to use the new port if changed
all
func start --port 7072

Fix Configuration and Runtime Issues

For: configuration_issues

Steps:

  1. Verify local.settings.json exists and contains required configuration
  2. Check that the correct Azure Functions Core Tools version is installed
  3. Ensure all required NuGet packages or npm dependencies are installed
  4. Validate function.json configuration for each function
  5. Update or reinstall binding extensions if needed
all
func --version

Fix Configuration and Runtime Issues

For: configuration_issues

Steps:

  1. Verify local.settings.json exists and contains required configuration
  2. Check that the correct Azure Functions Core Tools version is installed
  3. Ensure all required NuGet packages or npm dependencies are installed
  4. Validate function.json configuration for each function
  5. Update or reinstall binding extensions if needed
all
func extensions install

Fix Configuration and Runtime Issues

For: configuration_issues

Steps:

  1. Verify local.settings.json exists and contains required configuration
  2. Check that the correct Azure Functions Core Tools version is installed
  3. Ensure all required NuGet packages or npm dependencies are installed
  4. Validate function.json configuration for each function
  5. Update or reinstall binding extensions if needed
all
func start --verbose

# Summary

root@localhost:~# echo "Port 7071 Documentation Complete"

What it is: localhost:7071 is Localhost:7071 is the default port used by Azure Functions Core Tools for local development and testing of Azure Functions. This port allows developers to run, debug, and test serverless functions locally before deploying them to Azure cloud, providing a seamless development experience for serverless applications.

Who uses it: Azure Functions Core Tools, Azure Functions Extension, Azure CLI Functions, Postman/Thunder Client, Azure Functions Runtime, .NET Azure Functions, Node.js Azure Functions, Python Azure Functions, Function Host, Binding Extensions, Trigger Simulators, Azurite, Local API Gateways, Function Orchestrators

Access URL: http://localhost:7071