fix: normalize Ollama URLs to handle trailing slashes

- Added url-normalization utility to remove trailing slashes from base URLs
- Updated Ollama provider, embedder, and fetcher to use URL normalization
- This prevents double slashes in API endpoints when users include trailing slashes
- Added comprehensive tests for URL normalization utility

Fixes #6078

Author: roomote

src/api/providers/fetchers/ollama.ts

@@ -1,6 +1,7 @@
 import axios from "axios"
 import { ModelInfo, ollamaDefaultModelInfo } from "@roo-code/types"
 import { z } from "zod"
+import { joinUrlPath } from "../../../utils/url-normalization"
 
 const OllamaModelDetailsSchema = z.object({
 	family: z.string(),
@@ -65,15 +66,15 @@ export async function getOllamaModels(baseUrl = "http://localhost:11434"): Promi
 			return models
 		}
 
-		const response = await axios.get<OllamaModelsResponse>(`${baseUrl}/api/tags`)
+		const response = await axios.get<OllamaModelsResponse>(joinUrlPath(baseUrl, "/api/tags"))
 		const parsedResponse = OllamaModelsResponseSchema.safeParse(response.data)
 		let modelInfoPromises = []
 
 		if (parsedResponse.success) {
 			for (const ollamaModel of parsedResponse.data.models) {
 				modelInfoPromises.push(
 					axios
-						.post<OllamaModelInfoResponse>(`${baseUrl}/api/show`, {
+						.post<OllamaModelInfoResponse>(joinUrlPath(baseUrl, "/api/show"), {
 							model: ollamaModel.model,
 						})
 						.then((ollamaModelInfo) => {

src/api/providers/ollama.ts

@@ -6,6 +6,7 @@ import { type ModelInfo, openAiModelInfoSaneDefaults, DEEP_SEEK_DEFAULT_TEMPERAT
 import type { ApiHandlerOptions } from "../../shared/api"
 
 import { XmlMatcher } from "../../utils/xml-matcher"
+import { joinUrlPath } from "../../utils/url-normalization"
 
 import { convertToOpenAiMessages } from "../transform/openai-format"
 import { convertToR1Format } from "../transform/r1-format"
@@ -23,8 +24,9 @@ export class OllamaHandler extends BaseProvider implements SingleCompletionHandl
 	constructor(options: ApiHandlerOptions) {
 		super()
 		this.options = options
+		const baseUrl = this.options.ollamaBaseUrl || "http://localhost:11434"
 		this.client = new OpenAI({
-			baseURL: (this.options.ollamaBaseUrl || "http://localhost:11434") + "/v1",
+			baseURL: joinUrlPath(baseUrl, "/v1"),
 			apiKey: "ollama",
 		})
 	}

src/services/code-index/embedders/ollama.ts

@@ -6,6 +6,7 @@ import { t } from "../../../i18n"
 import { withValidationErrorHandling, sanitizeErrorMessage } from "../shared/validation-helpers"
 import { TelemetryService } from "@roo-code/telemetry"
 import { TelemetryEventName } from "@roo-code/types"
+import { joinUrlPath } from "../../../utils/url-normalization"
 
 // Timeout constants for Ollama API requests
 const OLLAMA_EMBEDDING_TIMEOUT_MS = 60000 // 60 seconds for embedding requests
@@ -32,7 +33,7 @@ export class CodeIndexOllamaEmbedder implements IEmbedder {
 	 */
 	async createEmbeddings(texts: string[], model?: string): Promise<EmbeddingResponse> {
 		const modelToUse = model || this.defaultModelId
-		const url = `${this.baseUrl}/api/embed` // Endpoint as specified
+		const url = joinUrlPath(this.baseUrl, "/api/embed") // Endpoint as specified
 
 		// Apply model-specific query prefix if required
 		const queryPrefix = getModelQueryPrefix("ollama", modelToUse)
@@ -140,7 +141,7 @@ export class CodeIndexOllamaEmbedder implements IEmbedder {
 		return withValidationErrorHandling(
 			async () => {
 				// First check if Ollama service is running by trying to list models
-				const modelsUrl = `${this.baseUrl}/api/tags`
+				const modelsUrl = joinUrlPath(this.baseUrl, "/api/tags")
 
 				// Add timeout to prevent indefinite hanging
 				const controller = new AbortController()
@@ -197,7 +198,7 @@ export class CodeIndexOllamaEmbedder implements IEmbedder {
 				}
 
 				// Try a test embedding to ensure the model works for embeddings
-				const testUrl = `${this.baseUrl}/api/embed`
+				const testUrl = joinUrlPath(this.baseUrl, "/api/embed")
 
 				// Add timeout for test request too
 				const testController = new AbortController()

src/utils/__tests__/url-normalization.test.ts

@@ -0,0 +1,78 @@
+import { describe, it, expect } from "vitest"
+import { normalizeBaseUrl, joinUrlPath } from "../url-normalization"
+
+describe("url-normalization", () => {
+	describe("normalizeBaseUrl", () => {
+		it("should remove a single trailing slash", () => {
+			expect(normalizeBaseUrl("http://localhost:11434/")).toBe("http://localhost:11434")
+		})
+
+		it("should remove multiple trailing slashes", () => {
+			expect(normalizeBaseUrl("http://localhost:11434//")).toBe("http://localhost:11434")
+			expect(normalizeBaseUrl("http://localhost:11434///")).toBe("http://localhost:11434")
+		})
+
+		it("should not modify URLs without trailing slashes", () => {
+			expect(normalizeBaseUrl("http://localhost:11434")).toBe("http://localhost:11434")
+		})
+
+		it("should handle URLs with paths", () => {
+			expect(normalizeBaseUrl("http://localhost:11434/api/")).toBe("http://localhost:11434/api")
+			expect(normalizeBaseUrl("http://localhost:11434/api/v1/")).toBe("http://localhost:11434/api/v1")
+		})
+
+		it("should handle URLs with query parameters", () => {
+			expect(normalizeBaseUrl("http://localhost:11434/?key=value")).toBe("http://localhost:11434/?key=value")
+			expect(normalizeBaseUrl("http://localhost:11434/api/?key=value")).toBe(
+				"http://localhost:11434/api/?key=value",
+			)
+		})
+
+		it("should handle empty strings", () => {
+			expect(normalizeBaseUrl("")).toBe("")
+		})
+
+		it("should handle URLs with ports", () => {
+			expect(normalizeBaseUrl("http://localhost:8080/")).toBe("http://localhost:8080")
+		})
+
+		it("should handle HTTPS URLs", () => {
+			expect(normalizeBaseUrl("https://api.example.com/")).toBe("https://api.example.com")
+		})
+	})
+
+	describe("joinUrlPath", () => {
+		it("should join base URL with path correctly", () => {
+			expect(joinUrlPath("http://localhost:11434", "/api/tags")).toBe("http://localhost:11434/api/tags")
+		})
+
+		it("should handle base URL with trailing slash", () => {
+			expect(joinUrlPath("http://localhost:11434/", "/api/tags")).toBe("http://localhost:11434/api/tags")
+		})
+
+		it("should handle base URL with multiple trailing slashes", () => {
+			expect(joinUrlPath("http://localhost:11434//", "/api/tags")).toBe("http://localhost:11434/api/tags")
+		})
+
+		it("should handle path without leading slash", () => {
+			expect(joinUrlPath("http://localhost:11434", "api/tags")).toBe("http://localhost:11434/api/tags")
+		})
+
+		it("should handle complex paths", () => {
+			expect(joinUrlPath("http://localhost:11434/", "/v1/api/embed")).toBe("http://localhost:11434/v1/api/embed")
+		})
+
+		it("should handle base URL with existing path", () => {
+			expect(joinUrlPath("http://localhost:11434/ollama", "/api/tags")).toBe(
+				"http://localhost:11434/ollama/api/tags",
+			)
+			expect(joinUrlPath("http://localhost:11434/ollama/", "/api/tags")).toBe(
+				"http://localhost:11434/ollama/api/tags",
+			)
+		})
+
+		it("should handle empty path", () => {
+			expect(joinUrlPath("http://localhost:11434", "")).toBe("http://localhost:11434/")
+		})
+	})
+})

src/utils/url-normalization.ts

@@ -0,0 +1,34 @@
+/**
+ * Normalizes a base URL by removing trailing slashes.
+ * This prevents double slashes when concatenating paths.
+ *
+ * @param url - The URL to normalize
+ * @returns The normalized URL without trailing slashes
+ *
+ * @example
+ * normalizeBaseUrl("http://localhost:11434/") // returns "http://localhost:11434"
+ * normalizeBaseUrl("http://localhost:11434") // returns "http://localhost:11434"
+ * normalizeBaseUrl("http://localhost:11434//") // returns "http://localhost:11434"
+ */
+export function normalizeBaseUrl(url: string): string {
+	// Remove all trailing slashes
+	return url.replace(/\/+$/, "")
+}
+
+/**
+ * Joins a base URL with a path, ensuring no double slashes.
+ *
+ * @param baseUrl - The base URL (will be normalized)
+ * @param path - The path to append (should start with /)
+ * @returns The joined URL
+ *
+ * @example
+ * joinUrlPath("http://localhost:11434/", "/api/tags") // returns "http://localhost:11434/api/tags"
+ * joinUrlPath("http://localhost:11434", "/api/tags") // returns "http://localhost:11434/api/tags"
+ */
+export function joinUrlPath(baseUrl: string, path: string): string {
+	const normalizedBase = normalizeBaseUrl(baseUrl)
+	// Ensure path starts with a single slash
+	const normalizedPath = path.startsWith("/") ? path : `/${path}`
+	return `${normalizedBase}${normalizedPath}`
+}