AJAX响应错误：net :: ERR_EMPTY_RESPONSE [英] AJAX response error: net::ERR_EMPTY_RESPONSE

问题描述

 var section = $（this）.data（'section'）; 
 var url ='/ users / delete /'+ id; 
 if确认（删除帖子））{
 $ .ajax（{
 url：url，
 type：'DELETE'，
 success：function（result）{
 console.log（'Deleting post ...'）; 
 window.location.href ='/ users / profile'; 
}，
 error：function（err）{
 console.log（err）; 
} 
}）; 
} 
}）; 
}）; 
  

BACK-END：

  router.delete（'/ delete /：id'，function（req，res，next）{
 
 var id = req.params.id; 
 var section = req.params.section; 
 
 var image =; 
 var author =; 
 
 var postRef = firebase.database（）。ref （posts /+ section +/+ id）; 
 var userRef = firebase.database（）。ref（users / posts /+ id）; 
 var likesRef = firebase.database ）.ref（users / likes /+ id）; 
 var hotRef = firebase.database（）。ref（hot /+ section +/+ id）; 
 
 postRef.once（'value'，function（snapshot）{
 image = snapshot.image; 
 author = snapshot.author; 
 
 if（firebase.auth（）。currentUser .uid.toString（）== author）{
 var file = bucket.file（image）; 
 $ b $ file.delete（function（err，apiResponse）{
 if（ err）{
 console.log（err）; 
} 
其他{
 console.log（成功删除）; 
 
 postRef.remove（）; 
 userRef.remove（）; 
 hotRef.remove（）; 
 likesRef.remove（）; 
 
 req.flash（'success_msg'，'删除后'）; 
 res.send（200）; 
} 
}）; 
} 
}）; 
}）; 
  

---

状态：

我添加了删除按钮，这样用户就可以删除他的帖子。

当用户点击按钮时，一个AJAX请求是我的Node.js服务器。

但我得到以下错误：

---

错误：

  net :: ERR_EMPTY_RESPONSE 
  code> 





---

问题： b

什么是这个错误，我该如何解决它？

解决方案

实际上是正确的。根据文档，Firebase会返回200个状态码， 空的回应。 net :: ERR_EMPTY_RESPONSE 就是这样。你应该做的是在响应中检查 null 和一个 200 状态码。如果确实如此，那么您可以放心地认为该帖子已被删除。

我个人认为Firebase应该考虑返回比 和一个通用的，全面的状态码。我更喜欢204无内容，或410 GONE。但是，唉。
$ b -

注意：如果帖子没有属于作者 - 即使你的条件不匹配，你的API仍然应该返回 （一个错误，可能在这种情况下）。像：

  if（firebase.auth（）。currentUser.uid.toString（）== author）{
 //你的代码
} else {
 res.status（401）.send（User does not have permission to complete the operation。）
} 
  

CODE:

FRONT-END

$(document).ready(function(){
        $('.delete-post').on('click', function(){
            var id = $(this).data('id');
            var section = $(this).data('section');
            var url = '/users/delete/'+id;
            if(confirm("Delete Post ?")){
                $.ajax({
                    url: url,
                    type:'DELETE',
                    success: function(result){
                        console.log('Deleting post...');
                        window.location.href='/users/profile';
                    },
                    error: function(err){
                        console.log(err);
                    }
                });
            }
        });
    });

BACK-END:

router.delete('/delete/:id', function(req, res, next) {

    var id = req.params.id;
    var section = req.params.section;

    var image = "";
    var author = "";

    var postRef = firebase.database().ref("posts/"+section+"/"+id);
    var userRef = firebase.database().ref("users/posts/"+id);
    var likesRef = firebase.database().ref("users/likes/"+id);
    var hotRef = firebase.database().ref("hot/"+section+"/"+id);

    postRef.once('value', function(snapshot){
        image = snapshot.image;
        author = snapshot.author;

        if (firebase.auth().currentUser.uid.toString() == author) {
            var file = bucket.file(image);

            file.delete(function (err, apiResponse) {
                  if (err) {
                    console.log(err);
                  }
                  else {
                    console.log("Deleted successfully");

                    postRef.remove();
                    userRef.remove();
                    hotRef.remove();
                    likesRef.remove();

                    req.flash('success_msg','Post Deleted');
                    res.send(200);
                  }
            });
        }    
    });
});

---

SITUATION:

I added delete buttons so the user could delete his posts.

When the user clicks the button an AJAX request is made to my Node.js server.

But I get the following error:

---

ERROR:

net::ERR_EMPTY_RESPONSE

---

QUESTION:

What is this error and how do I fix it ?

解决方案

The response you're getting is actually correct. Per the docs, Firebase returns a 200 status code and an empty response. net::ERR_EMPTY_RESPONSE is exactly that. What you should do is check for both null and a 200 status code in the response; if true, you can safely assume that the post was deleted.

My personal opinion is that Firebase should really consider returning something more substantial than nothing and a generic, catch-all status code. I'd prefer something like 204 No Content, or 410 Gone. But, alas.

—

Side note: this conditional will never return anything if the post doesn't belong to the author — your API should still return something (an error, probably in this case) even if your conditional doesn't match. Like:

if (firebase.auth().currentUser.uid.toString() == author) { 
    // your code
} else {
    res.status(401).send("User does not have permission to complete the operation.")
}

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