28 lines
1.1 KiB
JavaScript
28 lines
1.1 KiB
JavaScript
export function createMcpHttpHeaders(request, fallbackProtocolVersion) {
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const protocolVersion =
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request?.params?._meta?.["io.modelcontextprotocol/protocolVersion"] ||
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request?.params?.protocolVersion ||
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fallbackProtocolVersion;
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const headers = {
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...(protocolVersion ? { "MCP-Protocol-Version": protocolVersion } : {}),
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...(typeof request?.method === "string" ? { "Mcp-Method": request.method } : {}),
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};
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if (["tools/call", "prompts/get", "resources/read"].includes(request?.method)) {
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const name = request.method === "resources/read" ? request?.params?.uri : request?.params?.name;
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if (typeof name === "string" && name) {
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headers["Mcp-Name"] = encodeMirroredHeader(name);
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}
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}
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return headers;
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}
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export function encodeMirroredHeader(value) {
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const isPlainAscii = /^[\x20-\x7e]+$/.test(value) && value === value.trim();
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const matchesSentinel = value.startsWith("=?base64?") && value.endsWith("?=");
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return isPlainAscii && !matchesSentinel
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? value
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: `=?base64?${Buffer.from(value, "utf8").toString("base64")}?=`;
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}
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