fix(ai-statistics): adjust requestBodyBufferLimit (#2192)

Co-authored-by: Kent Dong <ch3cho@qq.com>

plugins/wasm-go/extensions/ai-statistics/main.go

@@ -27,6 +27,7 @@ func main() {
 }
 
 const (
+	defaultMaxBodyBytes uint32 = 100 * 1024 * 1024
 	// Context consts
 	StatisticsRequestStartTime = "ai-statistics-request-start-time"
 	StatisticsFirstTokenTime   = "ai-statistics-first-token-time"
@@ -176,6 +177,11 @@ func onHttpRequestHeaders(ctx wrapper.HttpContext, config AIStatisticsConfig, lo
 	if consumer, _ := proxywasm.GetHttpRequestHeader(ConsumerKey); consumer != "" {
 		ctx.SetContext(ConsumerKey, consumer)
 	}
+	hasRequestBody := wrapper.HasRequestBody()
+	if hasRequestBody {
+		_ = proxywasm.RemoveHttpRequestHeader("Content-Length")
+		ctx.SetRequestBodyBufferLimit(defaultMaxBodyBytes)
+	}
 
 	// Set user defined log & span attributes which type is fixed_value
 	setAttributeBySource(ctx, config, FixedValue, nil, log)