Function createProxyRequestHeaders

packages/dev-proxy/src/server.ts:96–132

(
  request: Request,
  targetUrl: URL,
  cookieRewrite: CookieRewriteOptions | false | undefined,
)

}

const createProxyRequestHeaders = (
  request: Request,
  targetUrl: URL,
  cookieRewrite: CookieRewriteOptions | false | undefined,
) => {
  const headers = new Headers(request.headers)
  headers.delete('host')
  headers.set('accept-encoding', UPSTREAM_ACCEPT_ENCODING)

  if (headers.has('origin'))
    headers.set('origin', targetUrl.origin)

  if (cookieRewrite) {
    const originalCookieHeader = headers.get('cookie') || undefined
    const localScopeKey = resolveCookieRewriteLocalScopeKey(cookieRewrite, targetUrl)
    const rewrittenCookieHeader = rewriteCookieHeaderForUpstream(headers.get('cookie') || undefined, {
      ...cookieRewrite,
      localScopeKey,
      useHostPrefix: targetUrl.protocol === 'https:',
    })
    if (rewrittenCookieHeader)
      headers.set('cookie', rewrittenCookieHeader)
    else
      headers.delete('cookie')

    if (localScopeKey && cookieRewrite.csrfHeader) {
      const scopedCsrfCookieName = toScopedLocalCookieName(cookieRewrite.csrfHeader.cookieName, localScopeKey)
      const scopedCsrfToken = getCookieHeaderValue(originalCookieHeader, scopedCsrfCookieName)
      if (scopedCsrfToken)
        headers.set(cookieRewrite.csrfHeader.headerName, scopedCsrfToken)
      else
        headers.delete(cookieRewrite.csrfHeader.headerName)
    }
  }

  return headers
}

const getSetCookieHeaders = (headers: Headers) => {
  const headersWithGetSetCookie = headers as Headers & { getSetCookie?: () => string[] }