电报将描述元标记显示为链接预览。 我更改了描述元标记，但我的网站的链接预览没有改变。 如何强制电报更新链接预览？
答案 0 :(得分：49)
转到@webpagebot并发送您要更新的链接（最多10个）。自动扫描您的网站并生成新的图片缩略图，网站名称和说明。
请记住<html prefix="og: http://ogp.me/ns#">标记中包含og前缀：function uploadFunction(fileType){
//CSRF attribute for spring security
var token = $("meta[name='_csrf']").attr("content");
var header = $("meta[name='_csrf_header']").attr("content");
var formData = new FormData();
var fileControl = document.getElementById(fileType);
var length = fileControl.files.length;
for(var i = 0; i< length; i++){
formData.append('file[]',fileControl.files[i]);
}
formData.append('idFleet', selectedFleet);
formData.append('idCar', $("#selectedCar").val());
if(fileType!='dat')
formData.append('initialKm', 0);
else
formData.append('initialKm', $("#initialKm").val());
return jQuery.ajax({
url : 'upload',
type: 'POST',
timeout: 0,//unlimited timeout
contentType: false,
processData: false,
data:formData,
//Catch upload progress
xhr: function()
{
var xhr = new window.XMLHttpRequest();
//Upload progress
xhr.upload.addEventListener("progress", function(evt){
if (evt.lengthComputable) {
var progress = Math.round((evt.loaded / evt.total) * 100) + '%';
//Update progress bar and text
document.getElementById("fileProgressBar").style.width = progress;
document.getElementById("percentualFile").innerHTML = progress;
}
}, false);
return xhr;
},
beforeSend:function(xhr) {
xhr.setRequestHeader(header, token);
waitingFile.showPleaseWait();
},
success: function(data,status,xhr){
//No exception occurred
if (data.status){
//Also the field are right(for e.g. form value)
if(data.success){
//Store information if file is datatable
if (fileType=='datatable')
$("#datatablePath").val(data.result[0]);
notifyMessage(fileType + " has been uploaded!", 'success');
uploadResult=true;
}
else{
//code if there are some error into form for example
}
} else {
notifyMessage(data.result, 'error');
$('#acquisitionWizard').bootstrapWizard('show',2);//show
uploadResult=false;
}
},
error: function(xhr,status,e){
window.location.href = "/DART/500";
}
}).complete(function() {
//add timeout because otherwise user could see a too fast waiting modal
setTimeout(function(){
//Reset to 0 progress bar and text
document.getElementById("fileProgressBar").style.width = "0%";
document.getElementById("percentualFile").innerHTML = "0%";
waitingFile.hidePleaseWait();
}, 1000);
});
}
或电报机器人不会更新图形缓存。
答案 1 :(得分：5)
您可以在共享链接时在网址末尾添加/?v=n，其中n可以是任意数字，并且在更新后会增加。
答案 2 :(得分：0)
将纯链接发送到@webpagebot无效，因此我使用了
<meta property="og:url" content="https://mylink.com" />
它奏效了。