A web proxy sits between a client and a destination server. The client sends a request to the proxy, which can forward it and return the server’s response, serve a cached response, or modify traffic along the way. The key distinction is whose side it serves: a forward proxy represents clients reaching the internet; a reverse proxy represents servers receiving requests from clients.
What is a proxy server?
A proxy server is an intermediary in a network conversation. Instead of communicating directly with a destination, a client sends a request to the proxy. The proxy may pass that request onward, choose a different destination, return a stored response, or change request or response details. It may also apply rules such as authentication, filtering, or logging.
“Proxy” describes a role in the path, not one particular product or privacy feature. A proxy may run on a user’s computer or inside an organization’s network, or it may be a managed service in front of a website. Its capabilities depend on its configuration and on the protocols it handles.
How does a reverse proxy differ from a forward proxy?
The difference is placement and whose requests the proxy represents—not simply which software is used.
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| Question | Forward proxy | Reverse proxy |
|---|---|---|
| Whose side does it serve? | The client or a group of clients | The server or a group of servers |
| Typical direction | Client requests going out to internet destinations | Requests coming in from clients to a website or application |
| Common purpose | Apply organization-wide access rules, filtering, authentication, logging, or caching | Route incoming requests, distribute load, cache, handle TLS, or reduce direct exposure of origin servers |
| What the destination or client sees | A destination may see the proxy’s network address instead of the client’s, depending on configuration | The client connects to the proxy; the proxy selects or contacts an upstream server |
Forward proxy: an intermediary for clients
A company might configure employee browsers or devices to send web requests through a forward proxy. The organization can then enforce access policies, authenticate users, record activity, filter destinations, or cache frequently requested content. The proxy can also make destinations see the proxy’s address rather than each client’s address.
That address substitution is not a guarantee of anonymity. The proxy operator may be able to observe or handle traffic, and a destination may still identify a user through account logins, browser data, or other signals. For HTTPS, what the proxy can inspect depends on whether it is merely tunneling encrypted traffic or is configured to intercept and decrypt it. Only use a proxy whose operator and handling practices you trust.
Reverse proxy: an intermediary for servers
A reverse proxy sits in front of one or more application or origin servers. Clients send requests to the proxy; it passes each request to an appropriate upstream server and returns the response. A website can use one to distribute requests across servers, cache content, buffer traffic, apply filtering, terminate TLS, or avoid exposing origin infrastructure directly.
These are possible functions, not automatic outcomes. Load distribution requires an appropriate upstream configuration; caching depends on cache rules and the content; and a reverse proxy reduces direct exposure only if the origin and network are configured so that clients cannot simply bypass it. A proxy can add controls, but it is not by itself a complete security defense or a promise of faster service.
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Proxy types describe different things
Transparent and non-transparent proxies
These terms describe whether a proxy changes traffic at the HTTP layer. A transparent proxy forwards requests without altering them there; a non-transparent proxy changes some aspect of a request or response before passing it along. This is a separate axis from forward versus reverse: either placement can involve different degrees of transparency.
“Transparent” does not mean invisible in every sense or incapable of affecting a connection. It refers to HTTP-level alteration, not a blanket guarantee about what users, applications, or network operators can detect.
Managed service or self-managed software
A reverse proxy may be software you operate yourself, such as NGINX, or part of a managed CDN or reverse-proxy service. Self-management offers control over configuration and deployment but requires you to operate and maintain the proxy and its upstream connections. A managed provider may simplify operations, but capabilities, controls, and service terms differ; check the provider’s documentation rather than assuming every service supports the same protocols or features.
What can a proxy do?
Proxy functions often overlap. A proxy’s placement does not, by itself, tell you which functions are enabled.
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- Forward or route traffic: pass a request to a destination or selected upstream server.
- Cache: serve a stored response when its rules allow, potentially avoiding a trip to the origin.
- Filter or authenticate: block traffic under a policy or require users to authenticate.
- Log: record information about requests, subject to configuration and applicable policy.
- Distribute load: send incoming requests to one of several upstream servers.
- Handle TLS: terminate an encrypted connection at the proxy, or pass encrypted traffic through it, depending on setup.
- Modify traffic: change headers or other request/response details before forwarding.
Choosing a proxy therefore starts with the job you need done. “I need to control employee access to external sites” points toward a forward proxy. “I need to route public traffic across application servers” points toward a reverse proxy. Caching, filtering, and authentication are requirements to verify in either case, not proof that a particular proxy type includes them automatically.
HTTPS tunnels, PAC files, and forwarding headers
CONNECT and HTTPS through a proxy
The HTTP CONNECT method asks a proxy to establish two-way communication with a destination. It is commonly used to carry a TLS connection through an HTTP proxy. Once a tunnel is established, the TLS connection is between the client and destination unless the deployment deliberately intercepts it. Proxy support may be restricted: a proxy can reject CONNECT, limit destination ports, or apply its own access rules.
PAC files choose direct or proxied routing
A Proxy Auto-Configuration (PAC) file contains JavaScript that tells a compatible client whether to connect directly or use a proxy for a given request. This can support rules that send some destinations through a proxy and others directly. The client must be configured to use the PAC file, and the proxy endpoints it names must be reachable and correctly configured.
Forwarding headers require a trust boundary
When requests pass through proxies, headers can carry information about earlier hops. The standardized Forwarded header and widely used alternatives—X-Forwarded-For, X-Forwarded-Host, and X-Forwarded-Proto—can convey client address, host, or protocol information. Via can identify proxy involvement.
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Do not treat a forwarding header supplied by an arbitrary client as authoritative. An application should trust such values only when they were set or sanitized by known proxies under its control. Otherwise, a client may be able to forge the apparent source address or protocol and affect logging, access controls, or application behavior.
When should you use a proxy?
Use a forward proxy for managed client egress
- You need a central place to apply outbound access policy or authentication for a group of clients.
- You need organization-managed filtering or request logging.
- You want to cache selected outbound resources, where cache rules and content make that useful.
- Your applications can be configured for the proxy’s protocol, authentication method, and CONNECT policy.
Use a reverse proxy for incoming application traffic
- You need a single entry point that routes requests to one or more application servers.
- You want to distribute requests, cache suitable content, or buffer traffic.
- You want the proxy to handle TLS or apply request filtering before traffic reaches the origin.
- You are prepared to configure the origin and network so the intended proxy path is actually enforced.
When a proxy is not the answer
If the goal is only to capture a webpage as an image or PDF, a proxy is not inherently required. A browser-based capture can render a page directly; a screenshot API can perform that capture without you setting up a browser. That is a different task from routing or controlling network traffic through a proxy.
How to choose and configure the right approach
- Identify the traffic direction. For clients making outbound requests, evaluate a forward proxy. For public requests arriving at your application, evaluate a reverse proxy.
- List the required functions. Specify filtering, authentication, logging, caching, TLS handling, load distribution, or origin shielding separately. Confirm each is supported and configured.
- Check protocol fit. Confirm whether traffic is HTTP or another protocol, whether CONNECT is required, which ports are allowed, how clients discover the proxy, and whether the proxy can reach every upstream.
- Define who is trusted. Establish who operates the proxy, what it can observe or modify, and which proxy hops are trusted to set forwarding headers.
- Plan for bypass and failure. For a reverse proxy, decide whether origins are reachable except through the proxy. For a forward proxy, define what clients should do if it is unavailable and whether direct access is permitted.
- Test the actual path. Verify a request from the relevant client, confirm the selected upstream or destination, inspect headers only across trusted hops, and check that cache or access rules behave as intended.
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If your immediate task is a screenshot rather than proxy routing, ScreenshotNeo is a separate website screenshot API and MCP server for developers. One GET request can return a PNG, JPEG, WebP, or PDF. For example, this cURL request saves a WebP screenshot of Stripe:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options. ScreenshotNeo accepts cookie or consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each of those steps can be turned off. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing status. Its MCP server provides take_screenshot, get_page_info, and capture_pdf for AI agents and MCP clients. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots. These capture features do not make ScreenshotNeo a web proxy.
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Common problems and what to check
- The client cannot connect to the proxy: check the configured hostname and port, network reachability, and whether the proxy requires authentication.
- CONNECT fails for an HTTPS destination: confirm that CONNECT is enabled, that the destination port is allowed, and that the proxy can reach the destination.
- A reverse-proxied application reports the wrong host, scheme, or client address: check which forwarding headers the proxy sets and which trusted hops the application accepts. Do not trust arbitrary client-supplied values.
- Requests reach the origin without passing through the reverse proxy: review origin exposure and network access rules. A proxy in front of a server cannot enforce a path that clients can bypass.
- Cached content is stale or inappropriate: review cache keys, expiry, and the content’s cacheability. Caching is a configured behavior, not an automatic property of every proxy.
- Some destinations work directly but not through the proxy: inspect proxy policy, supported protocols, port restrictions, and any PAC routing decision for that destination.
Performance, reliability, and cost considerations
A proxy can reduce repeated origin work when cache hits are possible, distribute load when upstreams are configured for it, or add a network hop that increases latency. The actual result depends on traffic, distance, cache rules, proxy capacity, and origin behavior; there is no universal speed improvement. A proxy also becomes a component that must be monitored and kept available. Plan capacity, failover, updates, and clear behavior during outages according to the consequences of losing that path.
Costs depend on whether the proxy is self-managed or provided as a service, and on the infrastructure, traffic, support, and operational work involved. Compare the service’s actual limits and billing model rather than assuming that all reverse proxies or CDNs charge in the same way.
Frequently Asked Questions
Does using a proxy encrypt my traffic?
Not necessarily. A proxy can tunnel an existing HTTPS/TLS connection, but the word “proxy” alone does not mean traffic is encrypted. Encryption and inspection depend on the client, destination, and proxy configuration.
Is a reverse proxy the same as a VPN?
No. A reverse proxy accepts traffic for servers, while a VPN creates a network tunnel for a device or network. They serve different roles, even though both can affect how traffic travels.
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