Support Expect: 100-continue request

[NghiaTranUIT]

🐶 Brief

If it's Expect: 100-continue request, it means the flow we handle the data is kind of difference.

1. The client will only sent the headers (including the Expect header) and no body.
2. Proxyman handles and return Code 100
3. Client starts sending the body
4. Proxyman handles

Ref: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/100

👑 Criteria

• Detect if it's expect 100-continue request
• Return code 100
• Handle response body properly

[NghiaTranUIT]

All done

🤯 Changelogs

• Send code 100 and handle body request properly
• Don't finish the request if it's expect: 100-continue request