overwrite redirect SSG meta.status to 200 for RSC requests

[gaojude]

For a static route that simply returns a redirect:

export default function Page() {
  redirect("/about");
}

the SSG generates a .meta file for the route at build time, that looks like:

{
  "status": 307,
  "headers": {
    "location": "/about"
  }
}

On next start, if a request matches this route, the status code is retrieved from the file and returned to the response. This is perfectly fine for DOC requests. However, if the request is an RSC request, its RSC payload should have already encoded the redirect instruction:

1:"$Sreact.fragment"
2:I[657,[],""]
3:I[8597,[],""]
5:I[5975,[],"OutletBoundary"]
8:I[4429,[],"AsyncMetadataOutlet"]
a:I[5975,[],"ViewportBoundary"]
c:I[5975,[],"MetadataBoundary"]
e:I[1363,[],""]
0:{"P":null,"b":"gelhztYnmFGzccJ4F6F4T","p":"","c":["","rsc-redirect"],"i":false,"f":[[["",{"children":["rsc-redirect",{"children":["__PAGE__",{}]}]},"$undefined","$undefined",true],["",["$","$1","c",{"children":[null,["$","html",null,{"lang":"en","children":["$","body",null,{"children":["$","$L2",null,{"parallelRouterKey":"children","error":"$undefined","errorStyles":"$undefined","errorScripts":"$undefined","template":["$","$L3",null,{}],"templateStyles":"$undefined","templateScripts":"$undefined","notFound":[[["$","title",null,{"children":"404: This page could not be found."}],["$","div",null,{"style":{"fontFamily":"system-ui,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif,\"Apple Color Emoji\",\"Segoe UI Emoji\"","height":"100vh","textAlign":"center","display":"flex","flexDirection":"column","alignItems":"center","justifyContent":"center"},"children":["$","div",null,{"children":[["$","style",null,{"dangerouslySetInnerHTML":{"__html":"body{color:#000;background:#fff;margin:0}.next-error-h1{border-right:1px solid rgba(0,0,0,.3)}@media (prefers-color-scheme:dark){body{color:#fff;background:#000}.next-error-h1{border-right:1px solid rgba(255,255,255,.3)}}"}}],["$","h1",null,{"className":"next-error-h1","style":{"display":"inline-block","margin":"0 20px 0 0","padding":"0 23px 0 0","fontSize":24,"fontWeight":500,"verticalAlign":"top","lineHeight":"49px"},"children":404}],["$","div",null,{"style":{"display":"inline-block"},"children":["$","h2",null,{"style":{"fontSize":14,"fontWeight":400,"lineHeight":"49px","margin":0},"children":"This page could not be found."}]}]]}]}]],[]],"forbidden":"$undefined","unauthorized":"$undefined"}]}]}]]}],{"children":["rsc-redirect",["$","$1","c",{"children":[null,["$","$L2",null,{"parallelRouterKey":"children","error":"$undefined","errorStyles":"$undefined","errorScripts":"$undefined","template":["$","$L3",null,{}],"templateStyles":"$undefined","templateScripts":"$undefined","notFound":"$undefined","forbidden":"$undefined","unauthorized":"$undefined"}]]}],{"children":["__PAGE__",["$","$1","c",{"children":["$L4",null,["$","$L5",null,{"children":["$L6","$L7",["$","$L8",null,{"promise":"$@9"}]]}]]}],{},null,false]},null,false]},null,false],["$","$1","h",{"children":[null,["$","$1","0db7ba866b0656c433aa56ad545d5b104626108ev",{"children":[["$","$La",null,{"children":"$Lb"}],null]}],["$","$Lc",null,{"children":"$Ld"}]]}],false]],"m":"$undefined","G":["$e","$undefined"],"s":false,"S":true}
4:E{"digest":"NEXT_REDIRECT;replace;/about;307;"}
f:"$Sreact.suspense"
10:I[4429,[],"AsyncMetadata"]
d:["$","div",null,{"hidden":true,"children":["$","$f",null,{"fallback":null,"children":["$","$L10",null,{"promise":"$@11"}]}]}]
7:null
b:[["$","meta","0",{"charSet":"utf-8"}],["$","meta","1",{"name":"viewport","content":"width=device-width, initial-scale=1"}]]
6:null
9:{"metadata":[],"error":null,"digest":"$undefined"}
11:{"metadata":"$9:metadata","error":null,"digest":"$undefined"}

Specifically,

4:E{"digest":"NEXT_REDIRECT;replace;/about;307;"}

Hence, it would be fine to simply return 200 status code.

There are two motivations for this change:

1. This new behaviour is consistent with Next.js apps hosted on Vercel. (I.e., it returns 200 for static RSC even if the meta.status = 307)
2. 307 redirect on RSC payload is an obstacle to enabling RSC validation

Existing E2E tests should cover this change.

[gaojude]

• Use custom status code for RSC redirects #80187
• overwrite redirect SSG meta.status to 200 for RSC requests #80379 👈 (View in Graphite)
• canary

This stack of pull requests is managed by Graphite. Learn more about stacking.