Add documentation for get_access_token() dependency function (#1446)

Co-authored-by: Jeremiah Lowin <jlowin@users.noreply.github.com>
Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>

docs/patterns/http-requests.mdx

@@ -1,87 +0,0 @@
----
-title: HTTP Requests
-sidebarTitle: HTTP Requests
-description: Accessing and using HTTP requests in FastMCP servers
-icon: network-wired
----
-import { VersionBadge } from '/snippets/version-badge.mdx'
-
-<VersionBadge version="2.2.11" />
-
-## Overview
-
-When running FastMCP as a web server, your MCP tools, resources, and prompts might need to access the underlying HTTP request information, such as headers, client IP, or query parameters.
-
-FastMCP provides a clean way to access HTTP request information through a dependency function.
-
-## Accessing HTTP Requests
-
-The recommended way to access the current HTTP request is through the `get_http_request()` dependency function:
-
-```python {2, 3, 11}
-from fastmcp import FastMCP
-from fastmcp.server.dependencies import get_http_request
-from starlette.requests import Request
-
-mcp = FastMCP(name="HTTP Request Demo")
-
-@mcp.tool
-async def user_agent_info() -> dict:
-    """Return information about the user agent."""
-    # Get the HTTP request
-    request: Request = get_http_request()
-    
-    # Access request data
-    user_agent = request.headers.get("user-agent", "Unknown")
-    client_ip = request.client.host if request.client else "Unknown"
-    
-    return {
-        "user_agent": user_agent,
-        "client_ip": client_ip,
-        "path": request.url.path,
-    }
-```
-
-This approach works anywhere within a request's execution flow, not just within your MCP function. It's useful when:
-
-1. You need access to HTTP information in helper functions
-2. You're calling nested functions that need HTTP request data
-3. You're working with middleware or other request processing code
-
-## Accessing HTTP Headers Only
-
-If you only need request headers and want to avoid potential errors, you can use the `get_http_headers()` helper:
-
-```python {2}
-from fastmcp import FastMCP
-from fastmcp.server.dependencies import get_http_headers
-
-mcp = FastMCP(name="Headers Demo")
-
-@mcp.tool
-async def safe_header_info() -> dict:
-    """Safely get header information without raising errors."""
-    # Get headers (returns empty dict if no request context)
-    headers = get_http_headers()
-    
-    # Get authorization header
-    auth_header = headers.get("authorization", "")
-    is_bearer = auth_header.startswith("Bearer ")
-    
-    return {
-        "user_agent": headers.get("user-agent", "Unknown"),
-        "content_type": headers.get("content-type", "Unknown"),
-        "has_auth": bool(auth_header),
-        "auth_type": "Bearer" if is_bearer else "Other" if auth_header else "None",
-        "headers_count": len(headers)
-    }
-```
-
-By default, `get_http_headers()` excludes problematic headers like `host` and `content-length`. To include all headers, use `get_http_headers(include_all=True)`.
-
-## Important Notes
-
-- HTTP requests are only available when FastMCP is running as part of a web application
-- Accessing the HTTP request with `get_http_request()` outside of a web request context will raise a `RuntimeError`
-- The `get_http_headers()` function **never raises errors** - it returns an empty dict when no request context is available
-- The `get_http_request()` function returns a standard [Starlette Request](https://www.starlette.io/requests/) object