英文:
Why can't I use a "file" as the "body" of an http request?
问题
"http.Post"函数期望将一个"Reader"作为请求体参数。"File"实现了"Reader"接口。但是，如果我将文件作为请求体参数传递，接收方总是会收到0字节的数据。为什么会这样呢？
以下是代码示例：
package main
import (
"fmt"
"net/http"
"os"
)
func main() {
file, err := os.Open("lala.txt")
if err != nil {
fmt.Printf("文件打开错误：%v \n", err)
}
defer file.Close()
resp, err := http.Post("http://requestb.in/11fta851", "text/plain", file)
if err != nil {
fmt.Printf("错误：%v \n", err)
} else {
fmt.Printf("响应状态码：%d \n", resp.StatusCode)
}
}
我知道你可以使用"file.ReadAll"将文件读取到缓冲区中并使用它。但这感觉像是重复的工作。
英文:
"http.Post" expects a "Reader" as the body argument. "File" implements "Reader".
But if I pass file as the body argument I always receive 0 bytes at the other end. Why?
Here is the code:
package main
import (
"fmt"
"net/http"
"os"
)
func main() {
file, err := os.Open("lala.txt")
if err != nil {
fmt.Printf("file open errrrr %v \n", err)
}
defer file.Close()
resp, err := http.Post("http://requestb.in/11fta851", "text/plain", file)
if err != nil {
fmt.Printf("errrrr %v \n", err)
} else {
fmt.Printf("resp code %d \n", resp.StatusCode)
}
}
I know that you could do "file.ReadAll" to a buffer and use that. But it feels like double work.
答案1
得分: 1
网站requestb.in似乎会忽略POST数据，如果未指定头部Content-Length。以下代码有效：
package main
import (
"fmt"
"net/http"
"os"
)
func main() {
file, err := os.Open("lala.txt")
if err != nil {
fmt.Printf("文件打开错误：%v \n", err)
}
defer file.Close()
req, _ := http.NewRequest("POST", "http://requestb.in/1fry3jy1", file)
req.ContentLength = 5
resp, err := http.DefaultClient.Do(req)
if err != nil {
fmt.Printf("错误：%v \n", err)
} else {
fmt.Printf("响应代码：%d \n", resp.StatusCode)
}
}
希望这对你有帮助！
英文:
The site requestb.in seems to ignore POST data if the header Content-Length is not specified. This code works:
package main
import (
"fmt"
"net/http"
"os"
)
func main() {
file, err := os.Open("lala.txt")
if err != nil {
fmt.Printf("file open errrrr %v \n", err)
}
defer file.Close()
req, _ := http.NewRequest("POST", "http://requestb.in/1fry3jy1", file)
req.ContentLength = 5
resp, err := http.DefaultClient.Do(req)
if err != nil {
fmt.Printf("errrrr %v \n", err)
} else {
fmt.Printf("resp code %d \n", resp.StatusCode)
}
}
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