Question

我有一个像这样的React / Express设置（简化为简洁）：

library(tidyverse)
library(lubridate)

scenario <- c("a","a","a","a","a","a","a","a","a","a","a","a","a","a",
              "b","b","b","b","b","b","b","b","b","b","b","b","b","b")

str_tstep <- c("2/29/1924", "3/31/1924",    "4/30/1924",    "5/31/1924",    "6/30/1924",    "7/31/1924",
               "8/31/1924", "9/30/1924",    "10/31/1924",   "11/30/1924",   "12/31/1924",   "1/31/1925",
               "3/31/1926", "9/30/1926",    "1/31/1922",    "1/31/1924",    "2/29/1924",    "5/31/1924",
               "10/31/1924","11/30/1924",   "12/31/1924",   "1/31/1925",    "2/28/1925",    "1/31/1926",
               "2/28/1926", "3/31/1926",    "1/31/1927",    "1/31/1928")

tstep <- mdy(str_tstep)

value <- c(260,396,348,347,368,397,418,419,190,290,504,323,800,800,355,408,250,365,222,
           299,504,323,800,397,288,800,387,415)
df <- data.frame(scenario, tstep, value)

当访问URL const path = require('path') const express = require('express') const CLIENT_BUILD_PATH = path.join(__dirname, '../build') const serialize = data => JSON.stringify({ data }) const app = express() app.use(express.static(CLIENT_BUILD_PATH)) app.get('/api/get/data', (request, response) => { Promise.resolve(loadData()).then(data => { console.log(data) response.writeHead(200, {'Content-Type': 'application/json'}) response.end(serialize(data)) }).catch((error) => { response.writeHead(200, {'Content-Type': 'application/json'}) response.end(serialize({})) }) }) // Catch all route app.get('*', (request, response) => { response.sendFile(path.join(CLIENT_BUILD_PATH, 'index.html')) })时，我想返回普通的JSON。

E.g。

/api/get/data

但是，返回的是React的 404页。

{ "foo": "bar", }解析得很好，我可以在控制台中看到loadData()。但不知何故，所有路线都会覆盖响应（或其他东西）。我想无论如何，我无法弄清楚。

更新：data的结构如下：

loadData()

Answer 1

ExpressJs具有JSON响应的缩写功能。在响应中使用.json()即可获得所需的结果，例如：

response.json(data);

JSON响应被捕获所有URL而被破坏并返回404页面

1 个答案: