Fixed: #172

feat(runtime): add Brotli and Zstd compression support, improve response handling

- Implemented Brotli and Zstd decompression handling in `FileRequestLogger` and executor logic for enhanced compatibility.
- Added `decodeResponseBody` utility for streamlined multi-encoding support (Gzip, Deflate, Brotli, Zstd).
- Improved resource cleanup with composite readers for proper closure under all conditions.
- Updated dependencies in `go.mod` and `go.sum` to include Brotli and Zstd libraries.

internal/logging/request_logger.go

@@ -15,6 +15,10 @@ import (
 	"strings"
 	"time"
 
+	"github.com/andybalholm/brotli"
+	"github.com/klauspost/compress/zstd"
+	log "github.com/sirupsen/logrus"
+
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/interfaces"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/util"
 )
@@ -411,6 +415,10 @@ func (l *FileRequestLogger) decompressResponse(responseHeaders map[string][]stri
 		return l.decompressGzip(response)
 	case "deflate":
 		return l.decompressDeflate(response)
+	case "br":
+		return l.decompressBrotli(response)
+	case "zstd":
+		return l.decompressZstd(response)
 	default:
 		// No compression or unsupported compression
 		return response, nil
@@ -431,7 +439,9 @@ func (l *FileRequestLogger) decompressGzip(data []byte) ([]byte, error) {
 		return nil, fmt.Errorf("failed to create gzip reader: %w", err)
 	}
 	defer func() {
-		_ = reader.Close()
+		if errClose := reader.Close(); errClose != nil {
+			log.WithError(errClose).Warn("failed to close gzip reader in request logger")
+		}
 	}()
 
 	decompressed, err := io.ReadAll(reader)
@@ -453,7 +463,9 @@ func (l *FileRequestLogger) decompressGzip(data []byte) ([]byte, error) {
 func (l *FileRequestLogger) decompressDeflate(data []byte) ([]byte, error) {
 	reader := flate.NewReader(bytes.NewReader(data))
 	defer func() {
-		_ = reader.Close()
+		if errClose := reader.Close(); errClose != nil {
+			log.WithError(errClose).Warn("failed to close deflate reader in request logger")
+		}
 	}()
 
 	decompressed, err := io.ReadAll(reader)
@@ -464,6 +476,48 @@ func (l *FileRequestLogger) decompressDeflate(data []byte) ([]byte, error) {
 	return decompressed, nil
 }
 
+// decompressBrotli decompresses brotli-encoded data.
+//
+// Parameters:
+//   - data: The brotli-encoded data to decompress
+//
+// Returns:
+//   - []byte: The decompressed data
+//   - error: An error if decompression fails, nil otherwise
+func (l *FileRequestLogger) decompressBrotli(data []byte) ([]byte, error) {
+	reader := brotli.NewReader(bytes.NewReader(data))
+
+	decompressed, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decompress brotli data: %w", err)
+	}
+
+	return decompressed, nil
+}
+
+// decompressZstd decompresses zstd-encoded data.
+//
+// Parameters:
+//   - data: The zstd-encoded data to decompress
+//
+// Returns:
+//   - []byte: The decompressed data
+//   - error: An error if decompression fails, nil otherwise
+func (l *FileRequestLogger) decompressZstd(data []byte) ([]byte, error) {
+	decoder, err := zstd.NewReader(bytes.NewReader(data))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create zstd reader: %w", err)
+	}
+	defer decoder.Close()
+
+	decompressed, err := io.ReadAll(decoder)
+	if err != nil {
+		return nil, fmt.Errorf("failed to decompress zstd data: %w", err)
+	}
+
+	return decompressed, nil
+}
+
 // formatRequestInfo creates the request information section of the log.
 //
 // Parameters:

internal/runtime/executor/claude_executor.go

@@ -3,6 +3,8 @@ package executor
 import (
 	"bufio"
 	"bytes"
+	"compress/flate"
+	"compress/gzip"
 	"context"
 	"fmt"
 	"io"
@@ -10,6 +12,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/andybalholm/brotli"
 	"github.com/klauspost/compress/zstd"
 	claudeauth "github.com/router-for-me/CLIProxyAPI/v6/internal/auth/claude"
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
@@ -89,31 +92,31 @@ func (e *ClaudeExecutor) Execute(ctx context.Context, auth *cliproxyauth.Auth, r
 		recordAPIResponseError(ctx, e.cfg, err)
 		return resp, err
 	}
-	defer func() {
-		if errClose := httpResp.Body.Close(); errClose != nil {
-			log.Errorf("response body close error: %v", errClose)
-		}
-	}()
 	recordAPIResponseMetadata(ctx, e.cfg, httpResp.StatusCode, httpResp.Header.Clone())
 	if httpResp.StatusCode < 200 || httpResp.StatusCode >= 300 {
 		b, _ := io.ReadAll(httpResp.Body)
 		appendAPIResponseChunk(ctx, e.cfg, b)
 		log.Debugf("request error, error status: %d, error body: %s", httpResp.StatusCode, string(b))
 		err = statusErr{code: httpResp.StatusCode, msg: string(b)}
+		if errClose := httpResp.Body.Close(); errClose != nil {
+			log.Errorf("response body close error: %v", errClose)
+		}
 		return resp, err
 	}
-	reader := io.Reader(httpResp.Body)
-	var decoder *zstd.Decoder
-	if hasZSTDEcoding(httpResp.Header.Get("Content-Encoding")) {
-		decoder, err = zstd.NewReader(httpResp.Body)
-		if err != nil {
-			recordAPIResponseError(ctx, e.cfg, err)
-			return resp, fmt.Errorf("failed to initialize zstd decoder: %w", err)
+	decodedBody, err := decodeResponseBody(httpResp.Body, httpResp.Header.Get("Content-Encoding"))
+	if err != nil {
+		recordAPIResponseError(ctx, e.cfg, err)
+		if errClose := httpResp.Body.Close(); errClose != nil {
+			log.Errorf("response body close error: %v", errClose)
 		}
-		reader = decoder
-		defer decoder.Close()
+		return resp, err
 	}
-	data, err := io.ReadAll(reader)
+	defer func() {
+		if errClose := decodedBody.Close(); errClose != nil {
+			log.Errorf("response body close error: %v", errClose)
+		}
+	}()
+	data, err := io.ReadAll(decodedBody)
 	if err != nil {
 		recordAPIResponseError(ctx, e.cfg, err)
 		return resp, err
@@ -192,19 +195,27 @@ func (e *ClaudeExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.A
 		err = statusErr{code: httpResp.StatusCode, msg: string(b)}
 		return nil, err
 	}
+	decodedBody, err := decodeResponseBody(httpResp.Body, httpResp.Header.Get("Content-Encoding"))
+	if err != nil {
+		recordAPIResponseError(ctx, e.cfg, err)
+		if errClose := httpResp.Body.Close(); errClose != nil {
+			log.Errorf("response body close error: %v", errClose)
+		}
+		return nil, err
+	}
 	out := make(chan cliproxyexecutor.StreamChunk)
 	stream = out
 	go func() {
 		defer close(out)
 		defer func() {
-			if errClose := httpResp.Body.Close(); errClose != nil {
+			if errClose := decodedBody.Close(); errClose != nil {
 				log.Errorf("response body close error: %v", errClose)
 			}
 		}()
 
 		// If from == to (Claude → Claude), directly forward the SSE stream without translation
 		if from == to {
-			scanner := bufio.NewScanner(httpResp.Body)
+			scanner := bufio.NewScanner(decodedBody)
 			buf := make([]byte, 20_971_520)
 			scanner.Buffer(buf, 20_971_520)
 			for scanner.Scan() {
@@ -228,7 +239,7 @@ func (e *ClaudeExecutor) ExecuteStream(ctx context.Context, auth *cliproxyauth.A
 		}
 
 		// For other formats, use translation
-		scanner := bufio.NewScanner(httpResp.Body)
+		scanner := bufio.NewScanner(decodedBody)
 		buf := make([]byte, 20_971_520)
 		scanner.Buffer(buf, 20_971_520)
 		var param any
@@ -304,29 +315,29 @@ func (e *ClaudeExecutor) CountTokens(ctx context.Context, auth *cliproxyauth.Aut
 		recordAPIResponseError(ctx, e.cfg, err)
 		return cliproxyexecutor.Response{}, err
 	}
-	defer func() {
-		if errClose := resp.Body.Close(); errClose != nil {
-			log.Errorf("response body close error: %v", errClose)
-		}
-	}()
 	recordAPIResponseMetadata(ctx, e.cfg, resp.StatusCode, resp.Header.Clone())
 	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
 		b, _ := io.ReadAll(resp.Body)
 		appendAPIResponseChunk(ctx, e.cfg, b)
+		if errClose := resp.Body.Close(); errClose != nil {
+			log.Errorf("response body close error: %v", errClose)
+		}
 		return cliproxyexecutor.Response{}, statusErr{code: resp.StatusCode, msg: string(b)}
 	}
-	reader := io.Reader(resp.Body)
-	var decoder *zstd.Decoder
-	if hasZSTDEcoding(resp.Header.Get("Content-Encoding")) {
-		decoder, err = zstd.NewReader(resp.Body)
-		if err != nil {
-			recordAPIResponseError(ctx, e.cfg, err)
-			return cliproxyexecutor.Response{}, fmt.Errorf("failed to initialize zstd decoder: %w", err)
+	decodedBody, err := decodeResponseBody(resp.Body, resp.Header.Get("Content-Encoding"))
+	if err != nil {
+		recordAPIResponseError(ctx, e.cfg, err)
+		if errClose := resp.Body.Close(); errClose != nil {
+			log.Errorf("response body close error: %v", errClose)
 		}
-		reader = decoder
-		defer decoder.Close()
+		return cliproxyexecutor.Response{}, err
 	}
-	data, err := io.ReadAll(reader)
+	defer func() {
+		if errClose := decodedBody.Close(); errClose != nil {
+			log.Errorf("response body close error: %v", errClose)
+		}
+	}()
+	data, err := io.ReadAll(decodedBody)
 	if err != nil {
 		recordAPIResponseError(ctx, e.cfg, err)
 		return cliproxyexecutor.Response{}, err
@@ -419,7 +430,7 @@ func (e *ClaudeExecutor) resolveClaudeConfig(auth *cliproxyauth.Auth) *config.Cl
 			continue
 		}
 		if attrKey != "" && strings.EqualFold(cfgKey, attrKey) {
-			if attrBase == "" || cfgBase == "" || strings.EqualFold(cfgBase, attrBase) {
+			if cfgBase == "" || strings.EqualFold(cfgBase, attrBase) {
 				return entry
 			}
 		}
@@ -438,17 +449,84 @@ func (e *ClaudeExecutor) resolveClaudeConfig(auth *cliproxyauth.Auth) *config.Cl
 	return nil
 }
 
-func hasZSTDEcoding(contentEncoding string) bool {
-	if contentEncoding == "" {
-		return false
-	}
-	parts := strings.Split(contentEncoding, ",")
-	for i := range parts {
-		if strings.EqualFold(strings.TrimSpace(parts[i]), "zstd") {
-			return true
+type compositeReadCloser struct {
+	io.Reader
+	closers []func() error
+}
+
+func (c *compositeReadCloser) Close() error {
+	var firstErr error
+	for i := range c.closers {
+		if c.closers[i] == nil {
+			continue
+		}
+		if err := c.closers[i](); err != nil && firstErr == nil {
+			firstErr = err
 		}
 	}
-	return false
+	return firstErr
+}
+
+func decodeResponseBody(body io.ReadCloser, contentEncoding string) (io.ReadCloser, error) {
+	if body == nil {
+		return nil, fmt.Errorf("response body is nil")
+	}
+	if contentEncoding == "" {
+		return body, nil
+	}
+	encodings := strings.Split(contentEncoding, ",")
+	for _, raw := range encodings {
+		encoding := strings.TrimSpace(strings.ToLower(raw))
+		switch encoding {
+		case "", "identity":
+			continue
+		case "gzip":
+			gzipReader, err := gzip.NewReader(body)
+			if err != nil {
+				_ = body.Close()
+				return nil, fmt.Errorf("failed to create gzip reader: %w", err)
+			}
+			return &compositeReadCloser{
+				Reader: gzipReader,
+				closers: []func() error{
+					gzipReader.Close,
+					func() error { return body.Close() },
+				},
+			}, nil
+		case "deflate":
+			deflateReader := flate.NewReader(body)
+			return &compositeReadCloser{
+				Reader: deflateReader,
+				closers: []func() error{
+					deflateReader.Close,
+					func() error { return body.Close() },
+				},
+			}, nil
+		case "br":
+			return &compositeReadCloser{
+				Reader: brotli.NewReader(body),
+				closers: []func() error{
+					func() error { return body.Close() },
+				},
+			}, nil
+		case "zstd":
+			decoder, err := zstd.NewReader(body)
+			if err != nil {
+				_ = body.Close()
+				return nil, fmt.Errorf("failed to create zstd reader: %w", err)
+			}
+			return &compositeReadCloser{
+				Reader: decoder,
+				closers: []func() error{
+					func() error { decoder.Close(); return nil },
+					func() error { return body.Close() },
+				},
+			}, nil
+		default:
+			continue
+		}
+	}
+	return body, nil
 }
 
 func applyClaudeHeaders(r *http.Request, apiKey string, stream bool) {