For a new remote Model Context Protocol (MCP) server, use stateless Streamable HTTP and expose it at a stable HTTPS endpoint such as /mcp. Implement focused tools, test locally with MCP Inspector, deploy to a host that can serve the endpoint, then test the deployed URL before connecting production clients. Add authentication and per-tool authorization before exposing account data or write actions. Local stdio is for a client and server running on the same machine, not for an Internet-facing service.
What a remote MCP server is—and which transport to choose
A remote MCP server is an MCP service reachable over a network. An MCP client connects to it to discover tools and invoke them; it is not enough to publish a web page or make a URL respond in a browser. The client and server need to exchange MCP protocol messages using a supported transport.
For a new remote deployment, choose Streamable HTTP and give the service a stable endpoint, commonly /mcp. Cloudflare’s Agents documentation calls Streamable HTTP the standard transport for remote MCP connections. Amazon Quick likewise supports remote servers and prefers HTTP streaming over the older Server-Sent Events (SSE) approach. SSE is deprecated for new servers in Cloudflare’s guidance.
Use stdio when a local MCP client launches a server process on the same machine. It is useful for local development and some desktop integrations, but it does not itself expose a server on the Internet. A remote deployment needs an HTTP-reachable endpoint, TLS at the public boundary, and network access from the clients that are meant to use it.
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Choose the hosting shape before implementing tools
The hosting decision affects reachability, state, authentication, tenant boundaries, logging, and how updates are rolled out. A public server can be simpler to reach, while a private service may be required when tools access internal systems. A gateway can sit in front of multiple servers and centralize routing and access control.
| Approach | What the documented guidance supports | Questions to resolve |
|---|---|---|
| Cloudflare Workers | Cloudflare documents a stateless createMcpHandler path, a /mcp endpoint, Wrangler deployment, and MCP Inspector testing. |
Decide how to authenticate clients, whether Cloudflare Access or an OAuth provider fits, and whether the application truly needs server-side session state. |
| AWS remote hosting | AWS describes remote HTTP/HTTPS hosting as a way to centralize authentication, authorization, versioning, and server updates. | Choose the network boundary, identity integration, deployment process, and whether a gateway should route to one or more servers. |
| Private enterprise endpoint | Amazon Quick requires an active VPC connection with network access for a private MCP server; OAuth discovery can use the configured auth-server VPC connection. | Verify that both the MCP endpoint and any authorization metadata endpoint are reachable from the configured network path. |
| Gateway in front of servers | AWS guidance describes gateways for centralized authentication, authorization, routing, protocol translation, and dynamic server or tool availability. | Define which team owns routing, policy, server registration, and incident diagnosis when a tool call crosses the gateway. |
Compare candidate setups on transport compatibility, state requirements, authentication and authorization, private-network reachability, tenant isolation, observability, deployment automation, version control, and cost. A managed runtime may reduce infrastructure work; a private deployment can preserve network boundaries; a gateway can simplify a fleet but adds another component to operate. The cited guidance does not establish a universal cost or performance winner.
Design a small, permission-conscious tool surface
Start with the user task, not with a full API schema. Cloudflare’s MCP guidance explicitly warns: “Do not treat your MCP server as a wrapper around your full API schema.” A narrow set of well-described tools is easier for clients to select correctly and easier for you to authorize safely.
- Expose operations that map to distinct user goals; avoid presenting every underlying endpoint just because it exists.
- Give each parameter a precise description, type, allowed range or format, and a clear explanation of whether it is required.
- Keep read operations separate from actions that modify data where practical, so authorization can differ by risk.
- Minimize the permissions each tool call receives. Do not rely on a tool description as a security control; enforce access on the server for every call.
- After changing tool names, descriptions, or parameter schemas, rerun evaluation tests. Those changes can alter which tool an AI client selects even when the implementation is unchanged.
For a stateless service, each request should carry what the server needs to process it rather than depending on a process-local conversation session. Choose stateful behavior only when the application has a documented need for it, such as session continuity or protocol features that depend on server-held state. State changes the deployment and migration model: requests may need consistent routing, and a rollout can affect active sessions.
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Build and test the service locally
Cloudflare’s documented example runs locally at http://localhost:8788 and serves MCP at /mcp. For a new stateless server on that platform, follow its createMcpHandler guide rather than starting with the older McpAgent quick-deploy path, which Cloudflare marks deprecated for new projects. The documentation summary available for this topic does not specify a complete application source file or scaffold command, so use the current Cloudflare Agents example for the handler implementation and project-specific configuration rather than copying an unverified code sample.
- Implement the handler and tool definitions. Use the platform’s current stateless handler pattern, mount it at
/mcp, and configure only the capabilities the server needs. - Start the local worker. Use the development command supplied by the current Cloudflare project template; the documented local URL is
http://localhost:8788/mcp. - Connect MCP Inspector. Configure Inspector with the local MCP URL, connect, list the exposed tools, and invoke representative tools with valid and invalid inputs.
- Check behavior, not just connectivity. Confirm the tool list and schemas are correct, authorization rejects disallowed calls, and error responses do not leak secrets or internal data.
Do not test by pasting /mcp into a regular browser and expecting a useful page. A browser navigation is not an MCP client: it does not perform the protocol exchange required to initialize a session, discover tools, and invoke them. Use Inspector or a compatible MCP client instead.
Deploy to HTTPS and test the remote endpoint
Cloudflare’s documented deployment command is npx wrangler@latest deploy. On successful deployment, the resulting worker URL follows the https://…workers.dev/mcp pattern. The exact hostname depends on the deployed worker, so copy the URL reported for your service rather than assuming a particular address.
- Review deployment configuration. Confirm that the handler is still mounted at
/mcp, environment-specific secrets are configured securely, and the intended authentication mode is enabled. - Deploy. Run
npx wrangler@latest deployfrom the configured project using the current Wrangler setup. - Copy the complete HTTPS MCP URL. Include the path, for example
https://your-worker.workers.dev/mcp; a worker’s root URL is not necessarily the MCP endpoint. - Connect MCP Inspector to the remote URL. Repeat tool discovery and representative calls against the deployed service, not only localhost.
- Test from each client environment. A server reachable from your development machine may still be blocked from a private network, a managed agent environment, or a client with different transport support.
A connected Git repository can also deploy on pushes or merges, according to Cloudflare’s deployment guidance. Whether you use that workflow or the CLI, keep changes reviewable and promote the same tested revision through the environments you operate.
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Some clients do not natively support remote transport. Cloudflare’s guide documents mcp-remote as a local proxy option and shows a Claude Desktop configuration that points the proxy at the remote URL. Treat that as a compatibility bridge: it runs locally for that client and does not convert the server itself into a different deployment. Follow the current client and proxy configuration for exact fields, since they can vary by client version.
Add OAuth and enforce authorization per tool
Do not leave user data or write actions on an unauthenticated endpoint. Cloudflare documents OAuth 2.1-based authorization, Cloudflare Access, third-party OAuth providers, and a server-managed OAuth flow. Its examples of provider integrations include Stytch, Auth0, WorkOS, and Descope. The right choice depends on the identity system and deployment boundary; none of those names alone means authorization is configured.
Authentication answers who is connecting. Authorization decides what that identity may do. Map granted scopes to capabilities, present user consent for access being requested, and verify the permission on every tool call. Do not assume that a valid login authorizes every tool or every record. For multi-tenant services, derive tenant access from trusted identity and server-side policy rather than accepting a caller-supplied tenant identifier as proof of access.
Amazon Quick’s discovery behavior is useful when validating compatibility with that client: it can receive an initial 401 containing a WWW-Authenticate header with a resource_metadata URL, then discover OAuth metadata there or fall back to a well-known URI. If Dynamic Client Registration is available, Quick can register automatically; otherwise, client credentials need to be entered manually. Public clients may use PKCE and omit a client secret. These are client-specific discovery and registration behaviors, not a reason to omit server-side authorization.
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Private connectivity, gateways, and operations
For an MCP service that reaches internal data, determine whether the MCP endpoint and its identity provider can both be reached from the client’s network context. Amazon Quick’s private-server setup requires an active VPC connection with network access; its OAuth discovery can use the configured auth-server VPC connection rather than the public Internet. A private hostname alone does not prove that a client has the route, DNS, or authorization path needed to connect.
A gateway is useful when agents otherwise need to register many servers independently. AWS describes a gateway as a way to centralize access control and routing, translate protocols, and make server or tool availability dynamic. That centralization can reduce repeated client setup, but it means the gateway’s policy, routing configuration, and operational health become part of every call path.
Before production, decide how you will observe request failures, tool errors, authentication denials, and deployment changes. Avoid logging credentials, tokens, or sensitive tool arguments. Establish who can change tool definitions and authorization policy, and retain a way to roll back a faulty release. The deployment guidance identifies these as hosting and operations dimensions to compare; it does not prescribe a specific logging product or service-level target.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Migrate existing SSE or stateful servers carefully
A new server should start on stateless Streamable HTTP, but an existing deployment may depend on SSE or on stateful behavior. Do not replace the transport simply because a new pattern is preferred if active clients or protocol behavior depend on the current lane.
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Cloudflare advises a staged migration when session state, RPC, pushed requests, streams, or replay are involved: serve a stateless lane and the legacy lane during transition as needed. Inventory which clients use which endpoint, verify the replacement with Inspector and real clients, and only retire the old path when its dependent behavior has been accounted for. This avoids treating a transport change as a URL-only edit when session semantics may also change.
Troubleshooting a remote deployment
| Symptom | Likely cause | What to check |
|---|---|---|
Opening /mcp in a browser shows an error or no useful page |
A browser navigation is not performing the MCP client exchange. | Connect with MCP Inspector or another compatible MCP client and use the full endpoint URL. |
| Inspector cannot connect locally | The local worker may not be running, the port or path may differ, or the handler may not be mounted at the expected endpoint. | Confirm the documented local address http://localhost:8788/mcp for the Cloudflare example and verify the active project configuration. |
| Local tests pass but the remote connection fails | The deployed URL, route, network access, or remote environment may differ from local assumptions. | Copy the deployed HTTPS endpoint, preserve /mcp, and test from the same client environment that will use it. |
| Client gets an authorization error or cannot find OAuth metadata | Credentials, scope consent, metadata discovery, or network reachability to the auth server may be misconfigured. | Inspect the challenge and metadata path expected by that client; for Amazon Quick, check the WWW-Authenticate resource metadata URL or the well-known fallback and confirm VPC reachability if private. |
| A user can invoke a tool they should not be able to use | The service authenticated the user but did not enforce authorization for that tool call. | Apply scope and resource checks on every call, separate sensitive capabilities, and verify tenant boundaries server-side. |
| New deployment breaks existing sessions or streams | A stateful or legacy SSE behavior may have been removed before clients migrated. | Restore the legacy lane while testing a stateless Streamable HTTP lane, then migrate clients in stages. |
Or skip the browser setup
If what you need is website screenshots for an agent rather than a server you control, ScreenshotNeo is a website screenshot API and MCP server with the tools take_screenshot, get_page_info, and capture_pdf. It does not deploy your own MCP server; it is an option for adding screenshot tasks to Claude, Cursor, or another MCP client.
For a direct screenshot API request, the cURL call below returns a WebP file. See the ScreenshotNeo API documentation for parameters and response details.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie or consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each of those steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing outcome in headers. Its MCP server lets AI agents request screenshots without building browser setup for that screenshot workflow. The free plan includes 1,000 screenshots a month without a card; paid plans start at $5 for 3,000 screenshots.
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FAQ
Can an MCP server be hosted behind a gateway?
Yes. AWS’s hosting guidance describes gateways that centralize authentication, authorization, routing, protocol translation, and server or tool availability. Whether to use one depends on whether central policy and routing solve a real multi-server or client-management need.
Does OAuth discovery mean a client can use every tool?
No. Discovery and registration help a client establish an authorization flow; the server still needs to check permission for each requested capability and resource.
Is a remote MCP endpoint automatically public?
No. It may be exposed publicly, restricted by an access layer, or reachable only through a private network connection. The hosting and client network must agree on the intended reachability.
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