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Improve error handling in the SSR middleware #31057

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merged 1 commit into from Nov 5, 2021
Merged

Improve error handling in the SSR middleware #31057

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36 changes: 18 additions & 18 deletions packages/next/build/webpack/loaders/next-middleware-ssr-loader/index.ts
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Expand Up @@ -57,10 +57,6 @@ export default async function middlewareRSCLoader(this: any) {
throw new Error('Your page must export a \`default\` component')
}

function renderError(err, status) {
return new Response(err.toString(), {status})
}

function wrapReadable(readable) {
const encoder = new TextEncoder()
const transformStream = new TransformStream()
Expand Down Expand Up @@ -104,15 +100,10 @@ export default async function middlewareRSCLoader(this: any) {
const Component = Page`
}

function render(request) {
async function render(request) {
const url = request.nextUrl
const query = Object.fromEntries(url.searchParams)

if (Document.getInitialProps) {
const err = new Error('Document.getInitialProps is not supported with server components, please remove it from pages/_document')
return renderError(err, 500)
}

// Preflight request
if (request.method === 'HEAD') {
return new Response('OK.', {
Expand Down Expand Up @@ -172,18 +163,27 @@ export default async function middlewareRSCLoader(this: any) {
const writer = transformStream.writable.getWriter()
const encoder = new TextEncoder()

renderToHTML(
{ url: url.pathname },
{},
url.pathname,
query,
renderOpts
).then(result => {
try {
const result = await renderToHTML(
{ url: url.pathname },
{},
url.pathname,
query,
renderOpts
)
result.pipe({
write: str => writer.write(encoder.encode(str)),
end: () => writer.close()
})
})
} catch (err) {
return new Response(
(err || 'An error occurred while rendering ' + url.pathname + '.').toString(),
{
status: 500,
headers: { 'x-middleware-ssr': '1' }
}
)
}

return new Response(transformStream.readable, {
headers: { 'x-middleware-ssr': '1' }
Expand Down
2 changes: 1 addition & 1 deletion test/integration/react-streaming-and-server-components/test/index.test.js
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Expand Up @@ -190,7 +190,7 @@ const documentSuite = {

expect(res.status).toBe(500)
expect(html).toContain(
'Document.getInitialProps is not supported with server components, please remove it from pages/_document'
'Error: `getInitialProps` in Document component is not supported with `concurrentFeatures` enabled.'
)
})
},
Expand Down