我设法让它工作。我相信这只是我自己的错误，没有正确填写URI。无论如何，我将发布我的解决方案中的片段以供将来参考。
客户端 html 文件格式部分：
<form action="/test-main/file-test" enctype="multipart/form-data" method="post">
<label for="file-upload">Upload your file :</label>
<input type="file" id="file-upload" name="file-upload" accept="image/*">
</form>
服务器 A 代码：
import (
"net/http"
"errors"
"fmt"
"log"
"io/ioutil"
"bytes"
"github.com/gorilla/mux"
)
func fileUpload(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
return log.Fatal(err)
}
r.Body = ioutil.NopCloser(bytes.NewReader(body))
// If Server A and B are separate docker images, you may need to use their docker subnet IP, like below.
proxyReq, err := http.NewRequest(r.Method, fmt.Sprintf("http://172.18.0.2:8082%s", r.RequestURI), bytes.NewReader(body))
if err != nil {
return log.Fatal(err)
}
for header, values := range r.Header {
for _, value := range values {
proxyReq.Header.Add(header, value)
}
}
client := &http.Client{}
resp, err := client.Do(proxyReq)
if err != nil {
return log.Fatal(err)
}
defer resp.Body.Close()
respBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
return log.Fatal(err)
}
// Process Server B response
// ...
}
func createRouter() *mux.Router {
r := mux.NewRouter()
testPath := r.PathPrefix("/test-main").Subrouter()
testPath.HandleFunc("/file-test", fileUpload)
return r
}
func main() {
// Create Server and Route Handlers
srv := &http.Server{
Handler: createRouter(),
Addr: ":8081",
ReadTimeout: 30 * time.Second,
WriteTimeout: 30 * time.Second,
}
// Start Server
go func() {
log.Println("Starting Server")
if err := srv.ListenAndServe(); err != nil {
log.Fatal(err)
}
}()
}
和服务器 B 代码：
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/gorilla/mux"
)
func uploadFile(w http.ResponseWriter, r *http.Request) {
if err := r.ParseMultipartForm(10 << 20); err != nil {
log.Fatal(err)
}
file, handler, err := r.FormFile("file-upload")
if err == http.ErrMissingFile {
return nil
}
if err != nil {
log.Fatal(err)
}
fmt.Printf("Uploaded File: %+v\n", handler.Filename)
fmt.Printf("File Size: %+v\n", handler.Size)
fmt.Printf("MIME Header: %+v\n", handler.Header)
defer file.Close()
// Create file
dst, err := os.Create(fmt.Sprintf("/some-destination-folder/%s", handler.Filename))
if err != nil {
log.Fatal(err)
}
// Copy the uploaded file to the created file on the file system.
if _, err := io.Copy(dst, file); err != nil {
if err2 := dst.Close(); err2 != nil {
log.Fatal(err)
}
log.Fatal(err)
}
dst.Close()
return nil
}
func (c *Controller) createRouter() *mux.Router {
r := mux.NewRouter()
testPath := r.PathPrefix("/test-main").Subrouter()
testPath.HandleFunc("/file-test", uploadFile)
return r
}
func main() {
// Create Server and Route Handlers
srv := &http.Server{
Handler: createRouter(),
Addr: ":8082",
ReadTimeout: 30 * time.Second,
WriteTimeout: 30 * time.Second,
}
// Start Server
go func() {
log.Println("Starting Server")
if err := srv.ListenAndServe(); err != nil {
log.Fatal(err)
}
}()
}
祝未来的读者好运。