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fix: send opencode User-Agent on upstream requests to avoid Zen free-tier 429 #138

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fix: send opencode User-Agent on upstream requests to avoid Zen free-tier 429 #138

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3 changes: 3 additions & 0 deletions internal/provider/opencode_go.go
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Original file line number Diff line number Diff line change
Expand Up @@ -191,6 +191,7 @@ func (p *OpenCodeGoProvider) executeAnthropic(ctx context.Context, req *core.Nor
}
httpReq.Header.Set("Content-Type", "application/json")
httpReq.Header.Set("Authorization", "Bearer "+apiKey)
httpReq.Header.Set("User-Agent", upstreamUserAgent)
httpReq.Header.Set("x-api-key", apiKey)

start := time.Now()
Expand Down Expand Up @@ -234,6 +235,7 @@ func (p *OpenCodeGoProvider) streamAnthropic(ctx context.Context, req *core.Norm
}
httpReq.Header.Set("Content-Type", "application/json")
httpReq.Header.Set("Authorization", "Bearer "+apiKey)
httpReq.Header.Set("User-Agent", upstreamUserAgent)
httpReq.Header.Set("x-api-key", apiKey)
httpReq.Header.Set("Accept", "text/event-stream")

Expand Down Expand Up @@ -265,6 +267,7 @@ func (p *OpenCodeGoProvider) doRequest(ctx context.Context, endpoint, apiKey str
}
httpReq.Header.Set("Content-Type", "application/json")
httpReq.Header.Set("Authorization", "Bearer "+apiKey)
httpReq.Header.Set("User-Agent", upstreamUserAgent)
if stream {
httpReq.Header.Set("Accept", "text/event-stream")
}
Expand Down
264 changes: 264 additions & 0 deletions internal/provider/opencode_useragent_test.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,264 @@
package provider

import (
"context"
"encoding/json"
"net/http"
"net/http/httptest"
"strings"
"testing"

"github.com/routatic/proxy/internal/config"
"github.com/routatic/proxy/internal/core"
"github.com/routatic/proxy/pkg/types"
)

func assertOpencodeUserAgentServer(t *testing.T, handler func(w http.ResponseWriter, r *http.Request)) *httptest.Server {
t.Helper()
return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ua := r.Header.Get("User-Agent")
if !strings.HasPrefix(ua, "opencode/") {
t.Errorf("User-Agent = %q, want prefix %q", ua, "opencode/")
}
handler(w, r)
}))
}

func chatCompletionServer(t *testing.T) *httptest.Server {
t.Helper()
return assertOpencodeUserAgentServer(t, func(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("Authorization") != "Bearer test-key" {
t.Errorf("Authorization = %q, want %q", r.Header.Get("Authorization"), "Bearer test-key")
}
w.Header().Set("Content-Type", "application/json")
_ = json.NewEncoder(w).Encode(types.ChatCompletionResponse{
ID: "cmpl-test",
Model: "test-model",
Choices: []types.Choice{
{Index: 0, Message: types.ChatMessage{Role: "assistant", Content: json.RawMessage(`"hi"`)}, FinishReason: "stop"},
},
Usage: types.UsageInfo{PromptTokens: 1, CompletionTokens: 1, TotalTokens: 2},
})
})
}

func sseServer(t *testing.T) *httptest.Server {
t.Helper()
return assertOpencodeUserAgentServer(t, func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
_, _ = w.Write([]byte("data: {\"choices\":[{\"delta\":{\"content\":\"hi\"}}]}\n\n"))
_, _ = w.Write([]byte("data: [DONE]\n\n"))
})
}

func TestOpenCodeZenProvider_Execute_OpencodeUserAgent(t *testing.T) {
server := chatCompletionServer(t)
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeZen: config.OpenCodeZenConfig{BaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeZenProvider(atomic)

req := &core.NormalizedRequest{Model: "deepseek-v4-flash-free", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}}
model := config.ModelConfig{ModelID: "deepseek-v4-flash-free"}
if got := p.WireFormat(model.ModelID); got != core.WireFormatOpenAIChat {
t.Fatalf("WireFormat(%q) = %v, want OpenAIChat", model.ModelID, got)
}
if _, err := p.Execute(context.Background(), req, model); err != nil {
t.Fatalf("Execute() error = %v", err)
}
}

func TestOpenCodeZenProvider_Stream_OpencodeUserAgent(t *testing.T) {
server := sseServer(t)
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeZen: config.OpenCodeZenConfig{BaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeZenProvider(atomic)

req := &core.NormalizedRequest{Model: "deepseek-v4-flash-free", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}, Stream: true}
model := config.ModelConfig{ModelID: "deepseek-v4-flash-free"}

body, err := p.Stream(context.Background(), req, model)
if err != nil {
t.Fatalf("Stream() error = %v", err)
}
defer func() { _ = body.Close() }()

buf := make([]byte, 1024)
if n, _ := body.Read(buf); n == 0 {
t.Error("Stream() returned empty body")
}
}

func TestOpenCodeZenProvider_ExecuteAnthropic_OpencodeUserAgent(t *testing.T) {
server := assertOpencodeUserAgentServer(t, func(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("Authorization") != "Bearer test-key" {
t.Errorf("Authorization = %q, want %q", r.Header.Get("Authorization"), "Bearer test-key")
}
if r.Header.Get("x-api-key") != "test-key" {
t.Errorf("x-api-key = %q, want %q", r.Header.Get("x-api-key"), "test-key")
}
w.Header().Set("Content-Type", "application/json")
_, _ = w.Write([]byte(`{"id":"msg-test","content":[{"type":"text","text":"hi"}]}`))
})
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeZen: config.OpenCodeZenConfig{BaseURL: server.URL, AnthropicBaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeZenProvider(atomic)

req := &core.NormalizedRequest{Model: "claude-sonnet-4.5", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}}
model := config.ModelConfig{ModelID: "claude-sonnet-4.5"}
if got := p.WireFormat(model.ModelID); got != core.WireFormatAnthropic {
t.Fatalf("WireFormat(%q) = %v, want Anthropic", model.ModelID, got)
}
if _, err := p.Execute(context.Background(), req, model); err != nil {
t.Fatalf("Execute() error = %v", err)
}
}

func TestOpenCodeZenProvider_StreamAnthropic_OpencodeUserAgent(t *testing.T) {
server := assertOpencodeUserAgentServer(t, func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
_, _ = w.Write([]byte("event: message_start\n"))
_, _ = w.Write([]byte("data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_1\"}}\n\n"))
})
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeZen: config.OpenCodeZenConfig{BaseURL: server.URL, AnthropicBaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeZenProvider(atomic)

req := &core.NormalizedRequest{Model: "claude-sonnet-4.5", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}, Stream: true}
model := config.ModelConfig{ModelID: "claude-sonnet-4.5"}

body, err := p.Stream(context.Background(), req, model)
if err != nil {
t.Fatalf("Stream() error = %v", err)
}
defer func() { _ = body.Close() }()

buf := make([]byte, 1024)
if n, _ := body.Read(buf); n == 0 {
t.Error("Stream() returned empty body")
}
}

func TestOpenCodeZenProvider_ExecuteResponses_OpencodeUserAgent(t *testing.T) {
server := assertOpencodeUserAgentServer(t, func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
_ = json.NewEncoder(w).Encode(types.ResponsesResponse{
ID: "resp-test", Object: "response", Created: 1, Model: "gpt-5.4",
Output: []types.ResponsesOutput{{Type: "message", Role: "assistant", Content: []types.ResponsesContent{{Type: "output_text", Text: "hi"}}}},
Usage: types.ResponsesUsage{InputTokens: 1, OutputTokens: 1},
})
})
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeZen: config.OpenCodeZenConfig{BaseURL: server.URL, ResponsesBaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeZenProvider(atomic)

req := &core.NormalizedRequest{Model: "gpt-5.4", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}}
model := config.ModelConfig{ModelID: "gpt-5.4"}
if got := p.WireFormat(model.ModelID); got != core.WireFormatOpenAIResponses {
t.Fatalf("WireFormat(%q) = %v, want OpenAIResponses", model.ModelID, got)
}
if _, err := p.Execute(context.Background(), req, model); err != nil {
t.Fatalf("Execute() error = %v", err)
}
}

func TestOpenCodeGoProvider_Execute_OpencodeUserAgent(t *testing.T) {
server := chatCompletionServer(t)
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeGo: config.OpenCodeGoConfig{BaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeGoProvider(atomic)

req := &core.NormalizedRequest{Model: "deepseek-v4-pro", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}}
model := config.ModelConfig{ModelID: "deepseek-v4-pro"}
if got := p.WireFormat(model.ModelID); got != core.WireFormatOpenAIChat {
t.Fatalf("WireFormat(%q) = %v, want OpenAIChat", model.ModelID, got)
}
if _, err := p.Execute(context.Background(), req, model); err != nil {
t.Fatalf("Execute() error = %v", err)
}
}

func TestOpenCodeGoProvider_Stream_OpencodeUserAgent(t *testing.T) {
server := sseServer(t)
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeGo: config.OpenCodeGoConfig{BaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeGoProvider(atomic)

req := &core.NormalizedRequest{Model: "deepseek-v4-pro", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}, Stream: true}
model := config.ModelConfig{ModelID: "deepseek-v4-pro"}

body, err := p.Stream(context.Background(), req, model)
if err != nil {
t.Fatalf("Stream() error = %v", err)
}
defer func() { _ = body.Close() }()

buf := make([]byte, 1024)
if n, _ := body.Read(buf); n == 0 {
t.Error("Stream() returned empty body")
}
}

func TestOpenCodeGoProvider_ExecuteAnthropic_OpencodeUserAgent(t *testing.T) {
server := assertOpencodeUserAgentServer(t, func(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("x-api-key") != "test-key" {
t.Errorf("x-api-key = %q, want %q", r.Header.Get("x-api-key"), "test-key")
}
w.Header().Set("Content-Type", "application/json")
_, _ = w.Write([]byte(`{"id":"msg-test","content":[{"type":"text","text":"hi"}]}`))
})
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeGo: config.OpenCodeGoConfig{BaseURL: server.URL, AnthropicBaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeGoProvider(atomic)

req := &core.NormalizedRequest{Model: "qwen3.5-plus", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}}
model := config.ModelConfig{ModelID: "qwen3.5-plus"}
if got := p.WireFormat(model.ModelID); got != core.WireFormatAnthropic {
t.Fatalf("WireFormat(%q) = %v, want Anthropic", model.ModelID, got)
}
if _, err := p.Execute(context.Background(), req, model); err != nil {
t.Fatalf("Execute() error = %v", err)
}
}

func TestOpenCodeGoProvider_StreamAnthropic_OpencodeUserAgent(t *testing.T) {
server := assertOpencodeUserAgentServer(t, func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
_, _ = w.Write([]byte("event: message_start\n"))
_, _ = w.Write([]byte("data: {\"type\":\"message_start\",\"message\":{\"id\":\"msg_1\"}}\n\n"))
})
defer server.Close()

cfg := &config.Config{APIKey: "test-key", OpenCodeGo: config.OpenCodeGoConfig{BaseURL: server.URL, AnthropicBaseURL: server.URL}}
atomic := config.NewAtomicConfig(cfg, "")
p := NewOpenCodeGoProvider(atomic)

req := &core.NormalizedRequest{Model: "qwen3.5-plus", Messages: []core.NormalizedMessage{{Role: "user", Content: "Hi"}}, Stream: true}
model := config.ModelConfig{ModelID: "qwen3.5-plus"}

body, err := p.Stream(context.Background(), req, model)
if err != nil {
t.Fatalf("Stream() error = %v", err)
}
defer func() { _ = body.Close() }()

buf := make([]byte, 1024)
if n, _ := body.Read(buf); n == 0 {
t.Error("Stream() returned empty body")
}
}
8 changes: 8 additions & 0 deletions internal/provider/opencode_zen.go
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,10 @@ import (
"github.com/routatic/proxy/pkg/types"
)

// upstreamUserAgent mirrors the opencode client User-Agent so Zen free-tier
// rate limiting treats routatic-proxy traffic like the native client.
const upstreamUserAgent = "opencode/routatic-proxy"

// OpenCodeZenProvider implements core.Provider for the OpenCode Zen backend.
// Zen supports four wire formats determined by model ID: Anthropic (Claude,
// Qwen), Responses (GPT), Gemini, and Chat Completions (everything else).
Expand Down Expand Up @@ -206,6 +210,7 @@ func (p *OpenCodeZenProvider) executeAnthropic(ctx context.Context, req *core.No
}
httpReq.Header.Set("Content-Type", "application/json")
httpReq.Header.Set("Authorization", "Bearer "+apiKey)
httpReq.Header.Set("User-Agent", upstreamUserAgent)
httpReq.Header.Set("x-api-key", apiKey)

start := time.Now()
Expand Down Expand Up @@ -249,6 +254,7 @@ func (p *OpenCodeZenProvider) streamAnthropic(ctx context.Context, req *core.Nor
}
httpReq.Header.Set("Content-Type", "application/json")
httpReq.Header.Set("Authorization", "Bearer "+apiKey)
httpReq.Header.Set("User-Agent", upstreamUserAgent)
httpReq.Header.Set("x-api-key", apiKey)
httpReq.Header.Set("Accept", "text/event-stream")

Expand Down Expand Up @@ -394,6 +400,7 @@ func (p *OpenCodeZenProvider) doRequest(ctx context.Context, endpoint, apiKey st
}
httpReq.Header.Set("Content-Type", "application/json")
httpReq.Header.Set("Authorization", "Bearer "+apiKey)
httpReq.Header.Set("User-Agent", upstreamUserAgent)
if stream {
httpReq.Header.Set("Accept", "text/event-stream")
}
Expand Down Expand Up @@ -424,6 +431,7 @@ func (p *OpenCodeZenProvider) doJSONRequest(ctx context.Context, endpoint, apiKe
}
httpReq.Header.Set("Content-Type", "application/json")
httpReq.Header.Set("Authorization", "Bearer "+apiKey)
httpReq.Header.Set("User-Agent", upstreamUserAgent)

resp, err := p.httpClient.Do(httpReq)
if err != nil {
Expand Down
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