Fix issue where path components are discarded for custom URLs

Sources/OpenAI/Private/Networking/Endpoint.swift

@@ -41,38 +41,60 @@ extension Endpoint {
       return components
    }
 
-   func request(
-      apiKey: Authorization,
-      openAIEnvironment: OpenAIEnvironment,
-      organizationID: String?,
-      method: HTTPMethod,
-      params: Encodable? = nil,
-      queryItems: [URLQueryItem] = [],
-      betaHeaderField: String? = nil,
-      extraHeaders: [String: String]? = nil)
-      throws -> URLRequest
-   {
-      let finalPath = path(in: openAIEnvironment)
-      var request = URLRequest(url: urlComponents(base: openAIEnvironment.baseURL, path: finalPath, queryItems: queryItems).url!)
-      request.addValue("application/json", forHTTPHeaderField: "Content-Type")
-      request.addValue(apiKey.value, forHTTPHeaderField: apiKey.headerField)
-      if let organizationID {
-         request.addValue(organizationID, forHTTPHeaderField: "OpenAI-Organization")
-      }
-      if let betaHeaderField {
-         request.addValue(betaHeaderField, forHTTPHeaderField: "OpenAI-Beta")
-      }
-      if let extraHeaders {
-         for header in extraHeaders {
-            request.addValue(header.value, forHTTPHeaderField: header.key)
-         }
-      }
-      request.httpMethod = method.rawValue
-      if let params {
-         request.httpBody = try JSONEncoder().encode(params)
-      }
-      return request
-   }
+	func request(
+		apiKey: Authorization,
+		openAIEnvironment: OpenAIEnvironment,
+		organizationID: String?,
+		method: HTTPMethod,
+		params: Encodable? = nil,
+		queryItems: [URLQueryItem] = [],
+		betaHeaderField: String? = nil,
+		extraHeaders: [String: String]? = nil
+	) throws -> URLRequest {
+		// Use path(in:) for flexibility, but ensure correct appending
+		let finalPath = path(in: openAIEnvironment) // Typically "/v1/chat/completions"
+
+		// Construct URL components
+		var components = URLComponents(string: openAIEnvironment.baseURL)!
+		let currentPath = components.path.isEmpty ? "" : components.path
+		components.path = currentPath + (finalPath.hasPrefix("/") ? "" : "/") + finalPath
+		if !queryItems.isEmpty {
+			components.queryItems = queryItems
+		}
+
+		// Validate and create request
+		guard let url = components.url else {
+			throw URLError(.badURL)
+		}
+		var request = URLRequest(url: url)
+
+		// Set headers
+		request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+		request.setValue(apiKey.value, forHTTPHeaderField: apiKey.headerField)
+		if let organizationID {
+			request.setValue(organizationID, forHTTPHeaderField: "OpenAI-Organization")
+		}
+		if let betaHeaderField {
+			request.setValue(betaHeaderField, forHTTPHeaderField: "OpenAI-Beta")
+		}
+		if let extraHeaders {
+			extraHeaders.forEach { request.setValue($1, forHTTPHeaderField: $0) }
+		}
+
+		// Set method and body
+		request.httpMethod = method.rawValue
+		if let params {
+			let encoder = JSONEncoder()
+			let encodedData = try encoder.encode(params)
+			if let jsonString = String(data: encodedData, encoding: .utf8) {
+				request.httpBody = Data(jsonString.replacingOccurrences(of: "\\/", with: "/").utf8)
+			} else {
+				throw EncodingError.invalidValue(params, EncodingError.Context(codingPath: [], debugDescription: "Failed to convert encoded data to UTF-8 string"))
+			}
+		}
+
+		return request
+	}
 
    func multiPartRequest(
       apiKey: Authorization,