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add support for Streamable HTTP server #294

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Merged
merged 5 commits into from
Apr 19, 2025
Merged

add support for Streamable HTTP server #294

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638603c
add support for streamable http server
shivdeepak Apr 10, 2025
f43a914
run prettier-fix
shivdeepak Apr 10, 2025
b397125
Merge branch 'main' into main
cliffhall Apr 17, 2025
3617863
Merge branch 'main' into main
shivdeepak Apr 18, 2025
8213402
attach auth headers to the streamable http request
shivdeepak Apr 18, 2025
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9 changes: 7 additions & 2 deletions client/src/App.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -81,9 +81,14 @@ const App = () => {
const [sseUrl, setSseUrl] = useState<string>(() => {
return localStorage.getItem("lastSseUrl") || "http://localhost:3001/sse";
});
const [transportType, setTransportType] = useState<"stdio" | "sse">(() => {
const [transportType, setTransportType] = useState<
"stdio" | "sse" | "streamable-http"
>(() => {
return (
(localStorage.getItem("lastTransportType") as "stdio" | "sse") || "stdio"
(localStorage.getItem("lastTransportType") as
| "stdio"
| "sse"
| "streamable-http") || "stdio"
);
});
const [logLevel, setLogLevel] = useState<LoggingLevel>("debug");
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7 changes: 4 additions & 3 deletions client/src/components/Sidebar.tsx
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Expand Up @@ -39,8 +39,8 @@ import {

interface SidebarProps {
connectionStatus: ConnectionStatus;
transportType: "stdio" | "sse";
setTransportType: (type: "stdio" | "sse") => void;
transportType: "stdio" | "sse" | "streamable-http";
setTransportType: (type: "stdio" | "sse" | "streamable-http") => void;
command: string;
setCommand: (command: string) => void;
args: string;
Expand Down Expand Up @@ -117,7 +117,7 @@ const Sidebar = ({
</label>
<Select
value={transportType}
onValueChange={(value: "stdio" | "sse") =>
onValueChange={(value: "stdio" | "sse" | "streamable-http") =>
setTransportType(value)
}
>
Expand All @@ -127,6 +127,7 @@ const Sidebar = ({
<SelectContent>
<SelectItem value="stdio">STDIO</SelectItem>
<SelectItem value="sse">SSE</SelectItem>
<SelectItem value="streamable-http">Streamable HTTP</SelectItem>
</SelectContent>
</Select>
</div>
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2 changes: 1 addition & 1 deletion client/src/lib/hooks/useConnection.ts
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Expand Up @@ -42,7 +42,7 @@ import { getMCPServerRequestTimeout } from "@/utils/configUtils";
import { InspectorConfig } from "../configurationTypes";

interface UseConnectionOptions {
transportType: "stdio" | "sse";
transportType: "stdio" | "sse" | "streamable-http";
command: string;
args: string;
sseUrl: string;
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8 changes: 8 additions & 0 deletions server/src/index.ts
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Expand Up @@ -14,6 +14,7 @@ import {
} from "@modelcontextprotocol/sdk/client/stdio.js";
import { Transport } from "@modelcontextprotocol/sdk/shared/transport.js";
import { SSEServerTransport } from "@modelcontextprotocol/sdk/server/sse.js";
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp.js";
import express from "express";
import { findActualExecutable } from "spawn-rx";
import mcpProxy from "./mcpProxy.js";
Expand Down Expand Up @@ -94,6 +95,13 @@ const createTransport = async (req: express.Request): Promise<Transport> => {

console.log("Connected to SSE transport");
return transport;
} else if (transportType === "streamable-http") {
const transport = new StreamableHTTPClientTransport(
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To Auth feature works you should send headers to the server

Suggested change
const transport = new StreamableHTTPClientTransport(
const STREAMABLE_HTTP_HEADERS_PASSTHROUGH = ["authorization"];
const headers: HeadersInit = {};
for (const key of STREAMABLE_HTTP_HEADERS_PASSTHROUGH) {
if (req.headers[key] === undefined) {
continue;
}
const value = req.headers[key];
headers[key] = Array.isArray(value) ? value[value.length - 1] : value;
}
const transport = new StreamableHTTPClientTransport(

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@shivdeepak shivdeepak Apr 18, 2025 •
edited
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Thanks. I have added the recommended changes and tested them. They work well.

MCP Inspector
Screenshot 2025-04-17 at 9 28 21 PM

Req/Resp Headers
Screenshot 2025-04-17 at 9 27 49 PM
Screenshot 2025-04-17 at 9 28 02 PM

new URL(query.url as string),
);
await transport.start();
console.log("Connected to Streamable HTTP transport");
return transport;
} else {
console.error(`Invalid transport type: ${transportType}`);
throw new Error("Invalid transport type specified");
Expand Down