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add support for proxy base path routing #733

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5681ffc
add support for proxy base path routing when using vscode-server port…
csantanapr Aug 19, 2025
c94aabe
Merge branch 'main' into vscode-proxy-routing
csantanapr Aug 19, 2025
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12 changes: 10 additions & 2 deletions client/bin/start.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,16 @@ function delay(ms) {
}

function getClientUrl(port, authDisabled, sessionToken, serverPort) {
const host = process.env.HOST || "localhost";
const baseUrl = `http://${host}:${port}`;
// Check for custom base URL from environment
const customBaseUrl = process.env.MCP_INSPECTOR_BASE_URL;

let baseUrl;
if (customBaseUrl) {
baseUrl = `${customBaseUrl}/proxy/${port}`;
} else {
const host = process.env.HOST || "localhost";
baseUrl = `http://${host}:${port}`;
}

const params = new URLSearchParams();
if (serverPort && serverPort !== DEFAULT_MCP_PROXY_LISTEN_PORT) {
Expand Down
18 changes: 14 additions & 4 deletions client/src/lib/hooks/useConnection.ts
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Expand Up @@ -284,7 +284,10 @@ export function useConnection({

const checkProxyHealth = async () => {
try {
const proxyHealthUrl = new URL(`${getMCPProxyAddress(config)}/health`);
const proxyAddress = getMCPProxyAddress(config);
const proxyHealthUrl = proxyAddress.startsWith('http')
? new URL(`${proxyAddress}/health`)
: new URL(`${proxyAddress}/health`, window.location.origin);
const { token: proxyAuthToken, header: proxyAuthTokenHeader } =
getMCPProxyAuthToken(config);
const headers: HeadersInit = {};
Expand Down Expand Up @@ -408,10 +411,13 @@ export function useConnection({
| StreamableHTTPClientTransportOptions
| SSEClientTransportOptions;

const proxyAddress = getMCPProxyAddress(config);
let mcpProxyServerUrl;
switch (transportType) {
case "stdio":
mcpProxyServerUrl = new URL(`${getMCPProxyAddress(config)}/stdio`);
mcpProxyServerUrl = proxyAddress.startsWith('http')
? new URL(`${proxyAddress}/stdio`)
: new URL(`${proxyAddress}/stdio`, window.location.origin);
mcpProxyServerUrl.searchParams.append("command", command);
mcpProxyServerUrl.searchParams.append("args", args);
mcpProxyServerUrl.searchParams.append("env", JSON.stringify(env));
Expand All @@ -434,7 +440,9 @@ export function useConnection({
break;

case "sse":
mcpProxyServerUrl = new URL(`${getMCPProxyAddress(config)}/sse`);
mcpProxyServerUrl = proxyAddress.startsWith('http')
? new URL(`${proxyAddress}/sse`)
: new URL(`${proxyAddress}/sse`, window.location.origin);
mcpProxyServerUrl.searchParams.append("url", sseUrl);
transportOptions = {
eventSourceInit: {
Expand All @@ -454,7 +462,9 @@ export function useConnection({
break;

case "streamable-http":
mcpProxyServerUrl = new URL(`${getMCPProxyAddress(config)}/mcp`);
mcpProxyServerUrl = proxyAddress.startsWith('http')
? new URL(`${proxyAddress}/mcp`)
: new URL(`${proxyAddress}/mcp`, window.location.origin);
mcpProxyServerUrl.searchParams.append("url", sseUrl);
transportOptions = {
eventSourceInit: {
Expand Down
8 changes: 8 additions & 0 deletions client/src/utils/configUtils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,14 @@ export const getMCPProxyAddress = (config: InspectorConfig): string => {
const proxyPort =
getSearchParam("MCP_PROXY_PORT") || DEFAULT_MCP_PROXY_LISTEN_PORT;

// If we're being served through a proxy path (like /proxy/6274/),
// construct relative URL to the proxy server port
const currentPath = window.location.pathname;
if (currentPath.includes('/proxy/')) {
const basePath = currentPath.replace(/\/proxy\/\d+\/.*$/, '');
return `${basePath}/proxy/${proxyPort}`;
}

return `${window.location.protocol}//${window.location.hostname}:${proxyPort}`;
};

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1 change: 1 addition & 0 deletions client/vite.config.ts
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Expand Up @@ -5,6 +5,7 @@ import { defineConfig } from "vite";
// https://vitejs.dev/config/
export default defineConfig({
plugins: [react()],
base: "./",
server: {
host: true,
},
Expand Down