Opera Software ASA

Networking Protocols support in Opera Presto 2.7

HTTP 1.0 and HTTP 1.1 support

Opera supports HTTP 1.0 (RFC 1945) and HTTP 1.1 (RFC 2616) protocols with the following exception:

• Content-Location

Opera does support:

• HTTP response header "X-Frame-Options"
  • This uses a proprietary specification produced by Microsoft with Opera's consultation.
  • It is a security feature that sites can opt into to prevent them from becoming targets of clickjacking.
  • The header has two values:

    X-Frame-Options: DENY
    X-Frame-Options: SAMEORIGIN

  • Further references:
    • See Mozilla developer center: The X-FRAME-OPTIONS response header
    • See MSDN Security and Privacy: Clickjacking Defense
    • See MSDN blog: Clickjacking Defenses

• Basic Authentication (passwords)
  • Digest Authentication support, excepting integrity check on body
• Byte range support which enables resuming downloads (provided the server supports it)
• Cachecontrol for:
  • no-cache (always check for fresh document)
  • no-store (do not save to disk)
• Multipart/mixed messages: RFC 2045 and RFC 2046
• Persistent connections (multiple request/response through one connection): RFC 2616
• SSL, TLS (RFC 2246) support (also through proxy/firewall)
• HTTP over TLS: RFC 2818

Other protocol support

• BitTorrent
• FTP: RFC 959:
  • Resume download is supported
  • FTP and HTTP can be downloaded to file
• IDNA2003: RFC 3490
• IRC: RFC 1459
• IMAP: RFC 3501
• POP: RFC 1939
• SMTP: RFC 2821
• NNTP: RFC 3977

Proxies

• HTTP
• FTP
• Gopher: RFC 1436
• WAIS: RFC 1625

Cookies

Opera provides support for the following items:

• RFC 2965: This document reflects implementation experience with RFC 2109 and makes it obsolete.
• Netscape cookies

Encryption

Opera supports 128 and 256 bit encryption (RSA, DSA and DH key exchange methods) for:

• Secure Sockets Layer (SSL) version 3
• Transport Layer Security (TLS) 1.0, 1.1, and 1.2

This is supported for HTTP (web), NNTP (news), POP and SMTP (e-mail).

• Note: SSL 2 is obsolete and no longer supported.

Further support is provided for

• Generating private keys and submitting certificate requests
• EV (Extended Validation)
  • An indicator (green bar) for EV certificates acts as an identifier in the Address bar

News

A simple online newsreader with support for encrypted newsservers and newsserver with passwords is provided.

• Supports decoding of single article attachments, MIME or unencoded.