feat: support gzip decode (#1962)

middleware/gzip.go

@@ -0,0 +1,27 @@
+package middleware
+
+import (
+	"compress/gzip"
+	"github.com/gin-gonic/gin"
+	"io"
+	"net/http"
+)
+
+func GzipDecodeMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		if c.GetHeader("Content-Encoding") == "gzip" {
+			gzipReader, err := gzip.NewReader(c.Request.Body)
+			if err != nil {
+				c.AbortWithStatus(http.StatusBadRequest)
+				return
+			}
+			defer gzipReader.Close()
+
+			// Replace the request body with the decompressed data
+			c.Request.Body = io.NopCloser(gzipReader)
+		}
+
+		// Continue processing the request
+		c.Next()
+	}
+}

router/relay.go

@@ -9,6 +9,7 @@ import (
 
 func SetRelayRouter(router *gin.Engine) {
 	router.Use(middleware.CORS())
+	router.Use(middleware.GzipDecodeMiddleware())
 	// https://platform.openai.com/docs/api-reference/introduction
 	modelsRouter := router.Group("/v1/models")
 	modelsRouter.Use(middleware.TokenAuth())