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[英]Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client. TRYING TO SEND DATA USINIG HTTP
[英]Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client. Why?
在 MognoDB 中保存圖像文件時遇到問題。 它在說錯誤
(節點:14849)UnhandledPromiseRejectionWarning:錯誤 [ERR_HTTP_HEADERS_SENT]:在將標頭發送到客戶端后無法設置標頭
當我搜索錯誤解決方案時,據說我在發送結果后發送結果。 我正在檢查我的代碼,它不是那樣的。 任何人都可以幫我找到錯誤嗎?
圖片上傳.js
const multer = require("multer");
const uploadImage = require("../../models/fileUpload");
const Storage = multer.diskStorage({
destination: "uploads",
filename: function (req, file, cb) {
const uniqueSuffix = Date.now() + "-" + Math.round(Math.random() * 1e9);
cb(null, file.fieldname + "-" + uniqueSuffix);
},
});
const upload = multer({
storage: Storage,
limits: {
fileSize: 1024 * 1024 * 5,
},
}).single("testImage");
const imageUpload = async (req, res) => {
try {
upload(req, res, (err) => {
if (err)
res.status(400).json({
success: false,
message: "Saving Failed",
});
const newImage = new uploadImage({
name: req.body.name,
image: {
data: req.body.image,
contentType: "image/png",
},
});
newImage
.save()
.then(() => {
res.status(201).json({
success: true,
msg: "Saved Successfully",
});
})
.catch((error) => {
res.status(500).json({
success: false,
msg: error.data,
});
});
});
} catch (err) {
console.log(err);
}
};
module.exports = { imageUpload };
在向客戶端發送響應之前返回在您發送的每個響應之前添加返回它會修復錯誤,也是一個好習慣
我無法用 else 正確定義if條件。
下面是重寫的代碼。
圖片上傳.js
const multer = require("multer");
const uploadImage = require("../../models/fileUpload");
// const Storage = multer.diskStorage({
// destination: "uploads",
// filename: function (req, file, cb) {
// const uniqueSuffix = Date.now() + "-" + Math.round(Math.random() * 1e9);
// cb(null, file.fieldname + "-" + uniqueSuffix);
// },
// });
const upload = multer({
// storage: Storage,
limits: {
fileSize: 1024 * 1024 * 5,
},
}).single("testImage");
const imageUpload = async (req, res) => {
try {
upload(req, res, (err) => {
if (err) {
res.status(400).json({
success: false,
message: "Saving Failed",
});
} else {
const newImage = new uploadImage({
name: req.body.name,
image: {
data: req.body.image,
contentType: "image/png",
},
});
newImage
.save()
.then(() => {
res.status(201).json({
success: true,
msg: "Saved Successfully",
});
})
.catch((error) => {
res.status(500).json({
success: false,
msg: error.data,
});
});
}
});
} catch (err) {
console.log(err);
}
};
module.exports = { imageUpload };
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