TRRSkippedReasons¶
These values are defined in TRRSkippedReason.h and are recorded on nsHostRecord for each resolution. We normally use them for telemetry or to determine the cause of a TRR failure.
TRR_UNSET¶
Value: 0
This reason is set on nsHostRecord before we attempt to resolve the domain. Normally we should not report this value into telemetry - if we do that means there’s a bug in the code.
TRR_OK¶
Value: 1
This reason is set when we got a positive TRR result. That means we used TRR for the DNS resolution, the HTTPS request got a 200 response, the response was properly decoded as a DNS packet and that packet contained relevant answers.
TRR_NO_GSERVICE¶
Value: 2
This reason is only set if there is no TRR service instance when trying to compute the TRR mode for a request. It indicates a bug in the implementation.
TRR_PARENTAL_CONTROL¶
Value: 3
This reason is set when we have detected system level parental controls are enabled. In this case we will not be using TRR for any requests.
TRR_OFF_EXPLICIT¶
Value: 4
This reason is set when DNS over HTTPS has been explicitly disabled by the user (by setting network.trr.mode to 5). In this case we will not be using TRR for any requests.
TRR_REQ_MODE_DISABLED¶
Value: 5
The request had the nsIRequest::TRRMode set to TRR_DISABLED_MODE. That is usually the case for request that should not use TRR, such as the TRRServiceChannel, captive portal and connectivity checks, DoHHeuristics checks, requests originating from PAC scripts, etc.
TRR_MODE_NOT_ENABLED¶
Value: 6
This reason is set when the TRRService is not enabled. The only way we would end up reporting this to telemetry would be if the TRRService was enabled when the request was dispatched, but by the time it was processed the TRRService was disabled.
TRR_MODE_UNHANDLED_DEFAULT¶
Value: 8
This reason is no longer used. This value may be recycled to mean something else in the future.
TRR_MODE_UNHANDLED_DISABLED¶
Value: 9
This reason is no longer used. This value may be recycled to mean something else in the future.
TRR_DISABLED_FLAG¶
Value: 10
This reason is used when retrying failed connections, sync DNS resolves on the main thread, or requests coming from webextensions that choose to skip TRR.
TRR_CHANNEL_DNS_FAIL¶
Value: 12
This reason is set when we fail to resolve the name of the DNS over HTTPS server.
TRR_IS_OFFLINE¶
Value: 13
This reason is recorded when the TRR request fails and the browser is offline (no active interfaces).
TRR_NOT_CONFIRMED¶
Value: 14
This reason is recorded when the TRR Service is not yet confirmed to work. Confirmation is only enabled when Do53 fallback is enabled.
TRR_DID_NOT_MAKE_QUERY¶
Value: 15
This reason is sent when TrrLookup exited without doing a TRR query. It may be set during shutdown, or may indicate an implementation bug.
TRR_UNKNOWN_CHANNEL_FAILURE¶
Value: 16
The TRR request failed with an unknown channel failure reason.
TRR_HOST_BLOCKED_TEMPORARY¶
Value: 17
The reason is recorded when the host is temporarily blocked. This happens when a previous attempt to resolve it with TRR failed, but fallback to Do53 succeeded.
TRR_NET_INTERRUPT¶
Value: 22
The request failed because the connection to the TRR server was interrupted.
TRR_NET_INADEQ_SEQURITY¶
Value: 23
The request failed because the connection to the TRR server used an invalid TLS configuration.
TRR_NO_ANSWERS¶
Value: 24
The TRR request succeeded but the encoded DNS packet contained no answers.
TRR_EXCLUDED¶
Value: 26
This reason is set when the domain being resolved is excluded from TRR, either via the network.trr.excluded-domains pref or because it was covered by the DNS Suffix of the user’s network.
TRR_HEURISTIC_TRIPPED_GOOGLE_SAFESEARCH¶
Value: 37
This reason is set when the google safesearch heuristic was tripped.
TRR_HEURISTIC_TRIPPED_YOUTUBE_SAFESEARCH¶
Value: 38
This reason is set when the youtube safesearch heuristic was tripped.
TRR_HEURISTIC_TRIPPED_ZSCALER_CANARY¶
Value: 39
This reason is set when the zscaler canary heuristic was tripped.
TRR_HEURISTIC_TRIPPED_CANARY¶
Value: 40
This reason is set when the global canary heuristic was tripped.
TRR_HEURISTIC_TRIPPED_MODIFIED_ROOTS¶
Value: 41
This reason is set when the modified roots (enterprise_roots cert pref) heuristic was tripped.
TRR_HEURISTIC_TRIPPED_PARENTAL_CONTROLS¶
Value: 42
This reason is set when parental controls are detected.
TRR_HEURISTIC_TRIPPED_THIRD_PARTY_ROOTS¶
Value: 43
This reason is set when the third party roots heuristic was tripped.
TRR_HEURISTIC_TRIPPED_ENTERPRISE_POLICY¶
Value: 44
This reason is set when enterprise policy heuristic was tripped.
TRR_HEURISTIC_TRIPPED_VPN¶
Value: 45
This reason is set when the heuristic was tripped by a vpn being detected.
TRR_HEURISTIC_TRIPPED_PROXY¶
Value: 46
This reason is set when the heuristic was tripped by a proxy being detected.
TRR_HEURISTIC_TRIPPED_NRPT¶
Value: 47
This reason is set when the heuristic was tripped by a NRPT being detected.