feat(openrouter): add support for custom API endpoint URL

[onlylhf]

• Add endpoint_url configuration to provider and model credential schemas
• Implement _normalize_endpoint_url() method to handle user-provided URLs
• Ensure endpoint URL is properly formatted with /v1 suffix
• Update dify-plugin dependency to 0.7.1
• Bump version to 0.0.32

OpenRouter reverse proxy script example

package main

import (
	"log"
	"net/http"
	"net/http/httputil"
	"net/url"
	"os"
)

// Configuration for the target host
const TargetHost = "https://openrouter.ai"

func main() {
	// 1. Parse the target URL
	targetURL, err := url.Parse(TargetHost)
	if err != nil {
		log.Fatalf("Failed to parse target URL: %v", err)
	}

	// 2. Create the reverse proxy
	proxy := httputil.NewSingleHostReverseProxy(targetURL)

	// 3. Custom Director to modify the request
	originalDirector := proxy.Director
	proxy.Director = func(req *http.Request) {
		// Execute default forwarding logic
		originalDirector(req)

		// -------------------------------------------------------
		// Key Step: Hide Source IP
		// -------------------------------------------------------
		// Explicitly remove headers usually added by proxies to ensure
		// OpenRouter sees this server's IP, not the original client's.
		req.Header.Del("X-Forwarded-For")
		req.Header.Del("X-Real-Ip")
		req.Header.Del("Forwarded")

		// Set the Host header to match the target.
		// This is crucial for passing Cloudflare checks.
		req.Host = targetURL.Host

		log.Printf("Forwarding request: Path=%s, Method=%s", req.URL.Path, req.Method)
	}

	// 4. Custom ModifyResponse (Optional)
	// Used to handle CORS headers
	proxy.ModifyResponse = func(resp *http.Response) error {
		resp.Header.Set("Access-Control-Allow-Origin", "*")
		resp.Header.Set("Access-Control-Allow-Headers", "*")
		return nil
	}

	// 5. Set up the handler function
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		// Handle CORS preflight requests (OPTIONS)
		if r.Method == http.MethodOptions {
			w.Header().Set("Access-Control-Allow-Origin", "*")
			w.Header().Set("Access-Control-Allow-Headers", "*")
			w.WriteHeader(http.StatusOK)
			return
		}

		// Execute proxy
		proxy.ServeHTTP(w, r)
	})

	// 6. Start the server
	port := os.Getenv("PORT")
	if port == "" {
		port = "8080"
	}
	log.Printf("OpenRouter proxy server started on :%s -> %s", port, TargetHost)
	if err := http.ListenAndServe(":"+port, nil); err != nil {
		log.Fatalf("Server failed to start: %v", err)
	}
}

Related Issues or Context

This PR contains Changes to Non-Plugin

• Documentation
• Other

This PR contains Changes to Non-LLM Models Plugin

• I have Run Comprehensive Tests Relevant to My Changes

This PR contains Changes to LLM Models Plugin

• My Changes Affect Message Flow Handling (System Messages and User→Assistant Turn-Taking)

• My Changes Affect Tool Interaction Flow (Multi-Round Usage and Output Handling, for both Agent App and Agent Node)

• My Changes Affect Multimodal Input Handling (Images, PDFs, Audio, Video, etc.)

• My Changes Affect Multimodal Output Generation (Images, Audio, Video, etc.)

• My Changes Affect Structured Output Format (JSON, XML, etc.)

• My Changes Affect Token Consumption Metrics

• My Changes Affect Other LLM Functionalities (Reasoning Process, Grounding, Prompt Caching, etc.)

• Other Changes (Add New Models, Fix Model Parameters etc.)

Version Control (Any Changes to the Plugin Will Require Bumping the Version)

• I have Bumped Up the Version in Manifest.yaml (Top-Level Version Field, Not in Meta Section)

Dify Plugin SDK Version

• I have Ensured dify_plugin>=0.3.0,<0.6.0 is in requirements.txt (SDK docs)

Environment Verification (If Any Code Changes)

Local Deployment Environment

• Dify Version is: , I have Tested My Changes on Local Deployment Dify with a Clean Environment That Matches the Production Configuration.

SaaS Environment

• I have Tested My Changes on cloud.dify.ai with a Clean Environment That Matches the Production Configuration

[gemini-code-assist]

Summary of Changes

Hello @onlylhf, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant enhancement to the OpenRouter integration by enabling users to define a custom API endpoint URL. This change provides greater flexibility, particularly for those who wish to route requests through a proxy or use a self-hosted OpenRouter instance. The implementation includes robust URL normalization to maintain consistency and proper API interaction. Additionally, core dependencies have been updated to ensure compatibility and leverage the latest features, alongside a standard version bump for the plugin.

Highlights

• Custom API Endpoint Support: Added the ability to configure a custom API endpoint URL for OpenRouter, allowing users to specify alternative hosts or proxy servers.
• Endpoint URL Normalization: Implemented a new static method _normalize_endpoint_url to ensure that user-provided endpoint URLs are correctly formatted, specifically by stripping trailing slashes and appending /v1 if missing.
• Dependency Updates: Updated the dify-plugin dependency to version 0.7.1 and adjusted several other Python package versions in requirements.txt.
• Plugin Version Bump: The OpenRouter plugin version has been incremented from 0.0.31 to 0.0.32.

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[gemini-code-assist]

Code Review

This pull request adds support for a custom API endpoint URL for OpenRouter, which is a valuable feature for users with proxy setups or custom deployments. The implementation across the YAML configuration and Python code is solid. I have one suggestion to refactor the URL normalization logic in llm.py to improve its clarity and maintainability. The dependency updates seem appropriate for this feature addition.