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Code Issues Releases Wiki Activity

Check if headers are sent (#3642)

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Tim Neutkens 2018-01-31 14:12:21 +01:00 committed by Arunoda Susiripala
parent c52a3246ae
commit 7b2cd84fee
2 changed files with 16 additions and 6 deletions
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12
lib/utils.js
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@ -46,15 +46,25 @@ export function getDisplayName (Component) {
return Component.displayName || Component.name || 'Unknown'
}
export function isResSent (res) {
return res.finished || res.headersSent
}
export async function loadGetInitialProps (Component, ctx) {
if (!Component.getInitialProps) return {}
const props = await Component.getInitialProps(ctx)
if (!props && (!ctx.res || !ctx.res.finished)) {
if (ctx.res && isResSent(ctx.res)) {
return props
}
if (!props) {
const compName = getDisplayName(Component)
const message = `"${compName}.getInitialProps()" should resolve to an object. But found "${props}" instead.`
throw new Error(message)
}
return props
}

10
server/render.js
View file

@ -7,7 +7,7 @@ import fresh from 'fresh'
import requireModule from './require'
import getConfig from './config'
import { Router } from '../lib/router'
import { loadGetInitialProps } from '../lib/utils'
import { loadGetInitialProps, isResSent } from '../lib/utils'
import { getAvailableChunks } from './utils'
import Head, { defaultHead } from '../lib/head'
import App from '../lib/app'
@ -66,7 +66,7 @@ async function doRender (req, res, pathname, query, {
const props = await loadGetInitialProps(Component, ctx)
// the response might be finshed on the getinitialprops call
if (res.finished) return
if (isResSent(res)) return
const renderPage = (enhancer = Page => Page) => {
const app = createElement(App, {
@ -99,7 +99,7 @@ async function doRender (req, res, pathname, query, {
const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
if (res.finished) return
if (isResSent(res)) return
if (!Document.prototype || !Document.prototype.isReactComponent) throw new Error('_document.js is not exporting a React element')
const doc = createElement(Document, {
@ -155,7 +155,7 @@ export async function renderScriptError (req, res, page, error, customFields, {
}
export function sendHTML (req, res, html, method, { dev }) {
if (res.finished) return
if (isResSent(res)) return
const etag = generateETag(html)
if (fresh(req.headers, { etag })) {
@ -179,7 +179,7 @@ export function sendHTML (req, res, html, method, { dev }) {
}
export function sendJSON (res, obj, method) {
if (res.finished) return
if (isResSent(res)) return
const json = JSON.stringify(obj)
res.setHeader('Content-Type', 'application/json')