Allow manually setting amphtml and canonical links

[ijjk]

To allow users to incrementally implement Next.js' AMP support and also handle extra cases, this allows manually adding amphtml and canonical links in AMP mode.

Closes: #7706
Closes: #8074

[github-actions]

Stats from current PR

Click to expand stats

	zeit/next.js canary	ijjk/next.js amp/allow-manual-rels	Change
Build Duration	13.4s	13s	-395ms
node_modules Size	45.5 MB	45.5 MB	⚠️ +379 B
Total Bundle (main, webpack, commons) Size	206 kB	206 kB	✓
Total Bundle (main, webpack, commons) gzip Size	67.9 kB	67.9 kB	✓
Client _app Size	2.39 kB	2.39 kB	✓
Client _app gzip Size	1.08 kB	1.08 kB	✓
Client _error Size	8.22 kB	8.22 kB	✓
Client _error gzip Size	3.16 kB	3.16 kB	✓
Client pages/index Size	343 B	343 B	✓
Client pages/index gzip Size	246 B	246 B	✓
Client pages/link Size	4.08 kB	4.08 kB	✓
Client pages/link gzip Size	1.8 kB	1.8 kB	✓
Client pages/routerDirect Size	423 B	423 B	✓
Client pages/routerDirect gzip Size	306 B	306 B	✓
Client pages/withRouter Size	435 B	435 B	✓
Client pages/withRouter gzip Size	301 B	301 B	✓
Client main Size	20 kB	20 kB	✓
Client main gzip Size	6.86 kB	6.86 kB	✓
Client commons Size	184 kB	184 kB	✓
Client commons gzip Size	59.7 kB	59.7 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	770 B	770 B	✓
Base Rendered Size	1.35 kB	1.35 kB	✓
Build Dir Size	704 kB	704 kB	⚠️ +382 B

Click to expand serverless stats

	zeit/next.js canary	ijjk/next.js amp/allow-manual-rels	Change
Build Duration	14.5s	14.9s	⚠️ +342ms
node_modules Size	45.5 MB	45.5 MB	⚠️ +379 B
Total Bundle (main, webpack, commons) Size	206 kB	206 kB	✓
Total Bundle (main, webpack, commons) gzip Size	67.9 kB	67.9 kB	✓
Client _app Size	2.39 kB	2.39 kB	✓
Client _app gzip Size	1.08 kB	1.08 kB	✓
Client _error Size	8.22 kB	8.22 kB	✓
Client _error gzip Size	3.16 kB	3.16 kB	✓
Client pages/index Size	343 B	343 B	✓
Client pages/index gzip Size	246 B	246 B	✓
Client pages/link Size	4.08 kB	4.08 kB	✓
Client pages/link gzip Size	1.8 kB	1.8 kB	✓
Client pages/routerDirect Size	423 B	423 B	✓
Client pages/routerDirect gzip Size	306 B	306 B	✓
Client pages/withRouter Size	435 B	435 B	✓
Client pages/withRouter gzip Size	301 B	301 B	✓
Client main Size	20 kB	20 kB	✓
Client main gzip Size	6.86 kB	6.86 kB	✓
Client commons Size	184 kB	184 kB	✓
Client commons gzip Size	59.7 kB	59.7 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	770 B	770 B	✓
Serverless pages/link Size	252 kB	252 kB	⚠️ +190 B
Serverless pages/link gzip Size	67.9 kB	67.9 kB	⚠️ +42 B
Serverless pages/index Size	245 kB	245 kB	⚠️ +190 B
Serverless pages/index gzip Size	65.7 kB	65.8 kB	⚠️ +39 B
Serverless pages/_error Size	244 kB	244 kB	⚠️ +190 B
Serverless pages/_error gzip Size	65.5 kB	65.5 kB	⚠️ +40 B
Serverless pages/routerDirect Size	245 kB	245 kB	⚠️ +190 B
Serverless pages/routerDirect gzip Size	65.7 kB	65.7 kB	⚠️ +39 B
Serverless pages/withRouter Size	245 kB	245 kB	⚠️ +190 B
Serverless pages/withRouter gzip Size	65.8 kB	65.9 kB	⚠️ +40 B
Build Dir Size	1.89 MB	1.89 MB	⚠️ +1.14 kB

[timneutkens]

This looks fine, what do you think @sebastianbenz?

[sebastianbenz]

👍 That totally makes sense. It's common for AMP pages to be served from a different sub-domain.