HTTP 306 (Switch Proxy): meaning and handling

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 306 is unused and reserved in the HTTP status code registry.

Could be also:
Constant	Type	OS
ERROR_SECURITY_STREAM_IS_INCONSISTENT	Win32 error	Windows
RESOURCE_OWNER_POINTER_INVALID	BugCheck Code	Windows

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HTTP_STATUS_USE_PROXY	HTTP_STATUS_TEMPORARY_REDIRECT

HTTP_STATUS_SWITCH_PROXY

This code had an early historical meaning but is no longer defined for normal HTTP use. A server returning 306 is therefore using a vendor-specific or obsolete behavior.

Do not implement generic client handling for this HTTP status. Preserve the response headers and body, then identify the server, proxy, or test tool that emitted it.

306 was defined in an earlier HTTP specification but is now reserved and has no current operational semantics. New applications should not emit it as a custom redirect or proxy instruction. If it appears in legacy traffic, identify the originating implementation rather than applying modern redirect behavior based solely on the number.

IANA HTTP Status Code Registry

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