A simple go client that simulates an HTTP request

mock_client.go

package main

import (
    "bytes"
    "context"
    "github.com/golang/protobuf/proto"
    myproto "github.com/selfboot/demo/proto" // This assumes that the generated protobuf code is in this package
    "io/ioutil"
    "log"
    "net/http"
)

func main() {
    imageBytes,
    err: = ioutil.ReadFile("/home/go_proj/83.jpeg") // with your picture path径
    if err != nil {
        log.Fatalf("failed to read file: %v", err)
    }

    imageData: = & myproto.OcrCommReq {
        ImgData: imageBytes,
    }

    serializedImageData, err: = proto.Marshal(imageData)
    if err != nil {
        log.Fatalf("failed to serialize image data: %v", err)
    }

    serializedImageDataTwice, err: = proto.Marshal( & myproto.MeshCallObj {
        Request: serializedImageData,
    })

    if err != nil {
        log.Fatalf("failed to serialize image data twice: %v", err)
    }

    req, err: = http.NewRequestWithContext(context.Background(), http.MethodPost, "http://localhost:8089", bytes.NewBuffer(serializedImageDataTwice))
    if err != nil {
        log.Fatalf("failed to create request: %v", err)
    }
    req.Header.Set("Content-Type", "application/x-protobuf")

    client: = & http.Client {}
    resp, err: = client.Do(req)
    if err != nil {
        log.Fatalf("failed to send request: %v", err)
    }
    defer resp.Body.Close()

    log.Printf("response header: %v", resp.Header)
    log.Printf("Transfer-Encoding: %v", resp.Header.Get("Transfer-Encoding"))

    body, err: = ioutil.ReadAll(resp.Body)
    if err != nil {
        log.Fatalf("failed to read response: %v", err)
    }
    if len(body) > 100 {
        log.Printf("first 100 bytes of response body: %v", string(body[: 100]))
    } else {
        log.Printf("response body: %v", string(body))
    }
}