请求成功200，但是没有返回数据。

Posted 2023-04-09

参考技术A response里显示failed to load response data

请求报错net::ERR_INCOMPLETE_CHUNKED_ENCODING 200

1，把请求单独复制到浏览器ok没问题。

2，在发布前，本地测试也没有问题。

3，返回数据量减小后没问题。

果断考虑服务端问题。

解决方法1：限制返回数据大小。

解决方法2：由于服务端nginx代理，可以直接改大Nginx的buffer解决。

我的RESTful API没有更新数据库，但是ajax返回成功

我在本教程之后构建了一个简单的API here当用户点击房间时，系统会提示他们是否需要清理房间，如果用户点击是，则会向我的API的更新部分发出ajax请求。请求返回成功，但由于某种原因，数据库未更新。我知道连接数据库没有问题，因为我可以从数据库中读取信息没问题。下面是调用前端的一小段片段。

//loop through room cells and add click listener
var roomCells = document.getElementsByClassName("zui-sticky-col");
for (i=0; i<roomCells.length; i++) {
  $(roomCells[i]).attr('data-room', i);
  $(roomCells[i]).on('click tap', function() {
    cleanFlag(this);
  });
}
//destroy modal 
$("body").on('click tap', '#closeIt', function() {
  destroyModal();
});
//destroy modal 
$("body").on('click tap', '.no', function() {
  destroyModal();
});
//add clean event
$("body").on('click tap', '.yes', function() {
  addClean();
});
//remove clean event
$("body").on('click tap', '.yesClean', function() {
  removeClean();
});
//function to schedule clean flag
function cleanFlag($this) {
  var attribute = $this.getAttribute("data-room");
  roomClean = attribute;
  $("body").addClass("lock");
  $(".zui-scroller").addClass("lock");
  $("body").append("<div class='overlay'></div>");
  $("body").append("<div class='modal'></div>");
  $(".modal").append("<p class='close'><i id='closeIt' class='far fa-times-circle fa-2x'></i></p>");  

  if (! $('[data-room='+roomClean+']').find('.fa-exclamation-circle').length) {
    $(".modal").append("<p class='modalTxt'>Does This Room Need to Be Cleaned?</p>");
    $(".modal").append("<div class='responseWrap'></div>");
    $(".responseWrap").append("<div class='no'>No</div>");
    $(".responseWrap").append("<div class='yes'>Yes</div>");
  }
  else {
    $(".modal").append("<p class='modalTxt'>Has This Room Been Cleaned?</p>");
    $(".modal").append("<div class='responseWrap'></div>");
    $(".responseWrap").append("<div class='no'>No</div>");
    $(".responseWrap").append("<div class='yesClean'>Yes</div>");
  }
}
// function to add clean flag
function addClean() {
  var temp = roomClean +1;
  $.ajax({
    type: "POST", //rest Type
    url: "https://alteredego.org/markiii/inn_api/rooms/update.php",
    dataType:'text',
    data:JSON.stringify( {"room": temp, "dirty": "1"}),
    success : function(data) {
    $('[data-room='+roomClean+']').append('<br><i class="fas fa-exclamation-circle"></i>');
    },
    failure: function(jqXhr, textStatus, errorMessage) {
      console.log(" Sorry I can't do that right now. Please try again. ", errorMessage );
  }
  });
  destroyModal();
}
// function to remove clean flag
function removeClean() {
  var temp = roomClean +1;
  $.ajax({
    type: "POST", //rest Type
    url: "https://alteredego.org/markiii/inn_api/rooms/update.php",
    dataType:'text',
    data:JSON.stringify( {"room": temp, "dirty": "0"}),
    success : function(data) {
      $('[data-room='+roomClean+'] i').remove('.fa-exclamation-circle');
      $('[data-room='+roomClean+'] br').remove();
    },
    failure: function(jqXhr, textStatus, errorMessage) {
      console.log(" Sorry I can't do that right now. Please try again. ", errorMessage );
  }
  });
  destroyModal();
}
// destroy modal
function destroyModal() {
  $(".modal").remove();
  $(".overlay").remove();
  $("body").removeClass("lock");
  $(".zui-scroller").removeClass("lock");
}


//function to schedule clean flag
function cleanFlag($this) {
  var attribute = $this.getAttribute("data-room");
  roomClean = attribute;
  $("body").addClass("lock");
  $(".zui-scroller").addClass("lock");
  $("body").append("<div class='overlay'></div>");
  $("body").append("<div class='modal'></div>");
  $(".modal").append("<p class='close'><i id='closeIt' class='far fa-times-circle fa-2x'></i></p>");  

  if (! $('[data-room='+roomClean+']').find('.fa-exclamation-circle').length) {
    $(".modal").append("<p class='modalTxt'>Does This Room Need to Be Cleaned?</p>");
    $(".modal").append("<div class='responseWrap'></div>");
    $(".responseWrap").append("<div class='no'>No</div>");
    $(".responseWrap").append("<div class='yes'>Yes</div>");
  }
  else {
    $(".modal").append("<p class='modalTxt'>Has This Room Been Cleaned?</p>");
    $(".modal").append("<div class='responseWrap'></div>");
    $(".responseWrap").append("<div class='no'>No</div>");
    $(".responseWrap").append("<div class='yesClean'>Yes</div>");
  }
}
//add room flag
function addRoomFlag(data) {
  for (i=0; i < data.room.length; i++) {
    if(data.room[i].dirty == 1) {
    $('[data-room='+i+']').append('<br><i class="fas fa-exclamation-circle"></i>');
    }
  }
}

// here are ajax calls *********

// make json call for room status
$.ajax({
  type: "get", //rest Type
  url: "https://alteredego.org/markiii/inn_api/rooms/read.php",
  processData: true,
  data: {},
  dataType: "json",
  success: function (data) {
    addRoomFlag(data);
    }
});
 
// function to add clean flag
function addClean() {
  var temp = roomClean +1;
  $.ajax({
    type: "POST", //rest Type
    url: "https://alteredego.org/markiii/inn_api/rooms/update.php",
    dataType:'text',
    data:JSON.stringify( {"room": temp, "dirty": "1"}),
    success : function(data) {
    $('[data-room='+roomClean+']').append('<br><i class="fas fa-exclamation-circle"></i>');
    },
    failure: function(jqXhr, textStatus, errorMessage) {
      console.log(" Sorry I can't do that right now. Please try again. ", errorMessage );
  }
  });
  destroyModal();
}
// function to remove clean flag
function removeClean() {
  var temp = roomClean +1;
  $.ajax({
    type: "POST", //rest Type
    url: "https://alteredego.org/markiii/inn_api/rooms/update.php",
    dataType:'text',
    data:JSON.stringify( {"room": temp, "dirty": "0"}),
    success : function(data) {
      $('[data-room='+roomClean+'] i').remove('.fa-exclamation-circle');
      $('[data-room='+roomClean+'] br').remove();
    },
    failure: function(jqXhr, textStatus, errorMessage) {
      console.log(" Sorry I can't do that right now. Please try again. ", errorMessage );
  }
  });
  destroyModal();
}

.zui-sticky-col {
    border-bottom: 0px;
    border-right: 0px;
    z-index:3;
    text-align: center;
    height: 60px;
    min-width:100%;
    width: 100%;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.modal {
    width:80%;
    z-index: 10;
    position: fixed;
    top: 50%;
    left:50%;
    transform: translate(-50%, -50%);
    background-color:white;
    padding-left:.8em;padding-right:.8em;
    padding-bottom: 10px;
}
.overlay {
    width:100%;
    height: 100%;
    z-index: 9;
    position: fixed;
    top: 0;
    left:0;
    background-color: rgba(0,0,0,0.5);
}
.modal input {
    -webkit-appearance: none;
    border-radius:none;
    display:block;
    width: 95%;
    margin: 0 auto;
    background-color:#3d3d3d;
    color: #e84118; 
    font-size: 18px;
    font-weight: 600;
    padding: 16px 0px;
    border-radius: 0;
    border: 0px;
    text-align: center;
}
.modalTxt {
    padding: 15px 0px; 
    margin: 0;
    font-size: 18px;
    color: #3d3d3d;
    font-weight: 600;
    text-align: center;
}
.close {
    padding: 10px 10px 0px 0px; 
    margin: 0;
    color: #e84118;
    font-weight: 600;
    text-align: right;
}
#closeIt {
    cursor: pointer;
}
.fa-times-circle {
    color:inherit;
}
.lock {
    overflow: hidden;
    width: 100vw;
    height: calc(100vh - 61px);
}
.responseWrap {
    margin-top: 10px;
    display: flex;
    justify-content: space-around;
}
.no, .yes, .yesClean {
    padding: .8em 1em;
    border-radius: 5px;
    cursor: pointer;
}
.no {
    background-color: red;
    color:white;
}
.yes, .yesClean {
    background-color: green;
    color:white;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://use.fontawesome.com/releases/v5.5.0/css/all.css" rel="stylesheet"/>
 <div class="zui-sticky-col">Room 1</div>
 <div class="zui-sticky-col">Room 2</div>
<div class="zui-sticky-col">Room 3</div>
<div class="zui-sticky-col">Room 4</div>
<div class="zui-sticky-col">Room 5</div>
<div class="zui-sticky-col">Room 6</div>
<div class="zui-sticky-col">Room 7</div>
<div class="zui-sticky-col">Room 8</div>
<div class="zui-sticky-col">Room 9</div>
<div class="zui-sticky-col">Room 10</div>
<div class="zui-sticky-col">Room 11</div>
<div class="zui-sticky-col">Room 12</div>

以下是我的API的一部分，与此问题有关

    // Rooms class (rooms.php)
<?php
    class Rooms{

        // database connection and table name
        private $conn;
        private $table_name = "********";

        // object properties
        public $room;
        public $dirty;

        // constructor with $db as database connection
        public function __construct($db){
            $this->conn = $db;
        }

        // read rooms
    function read(){

        // select all query
        $query = "SELECT
                     p.room, p.dirty
                FROM
                    " . $this->table_name . " p

                ORDER BY
                    p.room";

        // prepare query statement
        $stmt = $this->conn->prepare($query);

        // execute query
        $stmt->execute();

        return $stmt;
    }
    // update the room
    function update(){

        // update query
        $query = "UPDATE
                    " . $this->table_name . "
                SET
                   dirty =:dirty
                WHERE
                    room =:room";

        // prepare query statement
        $stmt = $this->conn->prepare($query);

        // sanitize
        $this->dirty=htmlspecialchars(strip_tags($this->dirty));
        $this->room=htmlspecialchars(strip_tags($this->room));

        // bind new values
        $stmt->bindParam(':dirty', $this->dirty);
        $stmt->bindParam(':room', $this->room);

        // execute the query
        if($stmt->execute()){
            return true;
        }
        return false;
    }
    } ?>

// update (update.php) this is the main driver
<?php
// required headers
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
header("Access-Control-Allow-Methods: POST");
header("Access-Control-Max-Age: 3600");
header("Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");

// include database and object files
include_once '../config/database.php';
include_once '../objects/rooms.php';

// get database connection
$database = new Database();
$db = $database->getConnection();

// prepare product object
$rooms = new Rooms($db);

// get id of room to be edited
$data = json_decode(file_get_contents("php://input"));

// set ID property of product to be edited
$rooms->room = $data->room;

// set product property values
$rooms->dirty = $data->dirty;

// update the product
if($rooms->update()){
    // set response code - 200 ok
    http_response_code(200);

}

// if unable to update the room, tell the user
else{

    // set response code - 503 service unavailable
    http_response_code(503);

}
?>

我有一种感觉，这个问题与我用ajax打电话来推动房间状态有关，但我不确定。我知道这是一个代码墙，几乎没有什么可以继续，但任何帮助都非常感谢。