我正在尝试构建一个搜索API,该API将位置作为参数并返回该位置的纬度和经度。 我正在使用http://geocode.xyz来获取位置的详细信息。 例如 : https://geocode.xyz/?locate=Warsaw,Poland&json=1 这将返回该位置所需的纬度和经度。
这是我的代码段:
const url = 'https://geocode.xyz/?locate=Warsaw,Poland&json=1';
const getData = async url => {
try {
const response = await fetch(url);
const json = await response.json();
console.log(json);
} catch (error) {
console.log(error);
}
};
getData(url);
有了这个,这就是我看到的错误:
node geocode.js
{success: false, error: { code: '006', message: 'Request Throttled.'}}
我猜这是因为我需要限制达到API https://geocode.xyz的请求数量。我不确定如何在异步/等待中使用速率限制器。任何帮助将不胜感激。
编辑: 根据以下答案,我仍然看到“请求已限制”
var request = require('request');
const fetch = require("node-fetch");
const requester = {
lastRequest: new Date(),
makeRequest: async function(url) {
// first check when last request was made
var timeSinceLast = (new Date()).getTime() - this.lastRequest.getTime();
if (timeSinceLast < 2000) {
this.lastRequest = new Date(this.lastRequest.getTime() + (2000 - timeSinceLast));
await new Promise(resolve => setTimeout(resolve, 2000-timeSinceLast));
// await new Promise(resolve => setTimeout(resolve, timeSinceLast));
}
const response = await fetch(url);
const json = await response.json();
return json;
}
};
requester.makeRequest('https://geocode.xyz/?locate=Warsaw,Poland&json=1')
.then(console.log)
我仍然遇到相同的错误:
{ success: false, error: { code: '006', message: 'Request Throttled.' } }
是因为geocode pricing吗?有什么方法可以限制用户端的请求速率?
答案 0 :(得分:1)
您可以创建一个用于发送所有请求的对象,并且该对象可以跟踪上次发出请求的时间。例如
const requester = {
lastRequest: new Date(2000,0,1),
makeRequest: async function (url) {
// first check when last request was made
var timeSinceLast = (new Date()).getTime() - this.lastRequest.getTime();
this.lastRequest = new Date();
if (timeSinceLast < 1000) {
this.lastRequest = new Date(this.lastRequest.getTime() + (1000 - timeSinceLast));
await new Promise(resolve => setTimeout(resolve, 1000-timeSinceLast));
}
// make request here and return result
const response = await fetch(url);
const json = await response.json();
return json;
}
};
https://jsfiddle.net/3k7b0grd/
如果您使用requester.request
,它只能让您每秒发出一次请求,并且等待足够长的时间(即使是连续的请求)也要遵守该速率限制