fix server quickstart

Author: dsp-ant

docs/quickstart/server.mdx

@@ -63,17 +63,10 @@ Writing to stdout will corrupt the JSON-RPC messages and break your server.
 
 ### Best Practices
 
-1. Use a logging library that writes to stderr or files, such as `logging` in Python.
-2. For JavaScript, be especially careful - `console.log()` writes to stdout by default
+1. Use a logging library that writes to stderr or files.
 
 ### Quick Examples
 
-````javascript
-// ❌ Bad (STDIO)
-console.log("Server started");
-
-// ✅ Good (STDIO)
-console.error("Server started");  // stderr is safe
 ```python
 # ❌ Bad (STDIO)
 print("Processing request")
@@ -382,6 +375,36 @@ This quickstart assumes you have familiarity with:
 - TypeScript
 - LLMs like Claude
 
+### Logging in MCP Servers
+
+When implementing MCP servers, be careful about how you handle logging:
+
+**For STDIO-based servers:** Never write to standard output (stdout). This includes:
+
+- `print()` statements in Python
+- `console.log()` in JavaScript
+- `fmt.Println()` in Go
+- Similar stdout functions in other languages
+
+Writing to stdout will corrupt the JSON-RPC messages and break your server.
+
+**For HTTP-based servers:** Standard output logging is fine since it doesn't interfere with HTTP responses.
+
+### Best Practices
+
+1. Use a logging library that writes to stderr or files, such as `logging` in Python.
+2. For JavaScript, be especially careful - `console.log()` writes to stdout by default
+
+### Quick Examples
+
+```javascript
+// ❌ Bad (STDIO)
+console.log("Server started");
+
+// ✅ Good (STDIO)
+console.error("Server started");  // stderr is safe
+```
+
 ### System requirements
 
 For TypeScript, make sure you have the latest version of Node installed.
@@ -835,6 +858,26 @@ Let's get started with building our weather server!
 For more information, see the [MCP Server Boot Starter](https://docs.spring.io/spring-ai/reference/api/mcp/mcp-server-boot-starter-docs.html) reference documentation.
 For manual MCP Server implementation, refer to the [MCP Server Java SDK documentation](/sdk/java/mcp-server).
 
+### Logging in MCP Servers
+
+When implementing MCP servers, be careful about how you handle logging:
+
+**For STDIO-based servers:** Never write to standard output (stdout). This includes:
+
+- `print()` statements in Python
+- `console.log()` in JavaScript
+- `fmt.Println()` in Go
+- Similar stdout functions in other languages
+
+Writing to stdout will corrupt the JSON-RPC messages and break your server.
+
+**For HTTP-based servers:** Standard output logging is fine since it doesn't interfere with HTTP responses.
+
+### Best Practices
+
+1. Use a logging library that writes to stderr or files. 
+2. Ensure any configured logging library will not write to STDOUT
+
 ### System requirements
 
 - Java 17 or higher installed.
@@ -1527,6 +1570,25 @@ This quickstart assumes you have familiarity with:
 - LLMs like Claude
 - .NET 8 or higher
 
+### Logging in MCP Servers
+
+When implementing MCP servers, be careful about how you handle logging:
+
+**For STDIO-based servers:** Never write to standard output (stdout). This includes:
+
+- `print()` statements in Python
+- `console.log()` in JavaScript
+- `fmt.Println()` in Go
+- Similar stdout functions in other languages
+
+Writing to stdout will corrupt the JSON-RPC messages and break your server.
+
+**For HTTP-based servers:** Standard output logging is fine since it doesn't interfere with HTTP responses.
+
+### Best Practices
+
+1. Use a logging library that writes to stderr or files
+
 ### System requirements
 
 - [.NET 8 SDK](https://dotnet.microsoft.com/download/dotnet/8.0) or higher installed.