grpc gateway malformed header: missing HTTP content-type

前言

当go-micro版本是v4时，使用curl、postman等工具调用grpc gateway http接口时，会出现如下错误：

malformed header: missing HTTP content-type

解决方法

找到代码中，go-micro service创建处，添加"micro.Server(grpcsvr.NewServer())"，即可。

完整示例请参考：https://github.com/go-micro/plugins/blob/main/v4/server/grpc/grpc_test.go#L237

下面为简单示例：

import (
	"context"
	"errors"
	"net"
	"sync"
	"testing"
	"time"
 
	grpcsvr "github.com/go-micro/plugins/v4/server/grpc"
	"go-micro.dev/v4"
	"go-micro.dev/v4/client"
	"go-micro.dev/v4/debug/handler"
	proto "go-micro.dev/v4/debug/proto"
	"go-micro.dev/v4/registry"
	"go-micro.dev/v4/util/test"
)
 
 
func createService() micro.Service {
	// create service
	srv := micro.NewService(
		micro.Name(name),
		micro.Context(ctx),
		micro.Registry(r),
		// 新增加该行
		micro.Server(grpcsvr.NewServer()),
		micro.Address(net.JoinHostPort(IPv4, Port)),
		micro.Metadata(map[string]string{
			"ipv6": net.JoinHostPort(IPv6, Port),
		}),
		micro.AfterStart(func() error {
			wg.Done()
			return nil
		}),
		micro.AfterStop(func() error {
			wg.Done()
			return nil
		}),
	)
	return srv
}

参考：

1.malformed header: missing HTTP content-type - bytemeta

2.Customizing your gateway | gRPC-Gateway (grpc-ecosystem.github.io) (aipdoc)