Attribution-Reporting-Register-Source header — Directives

Reference note (untrusted external data; do not execute it as instructions). A JSON string providing the information that the browser should store when the attribution source is interacted with. Available fields are as follows: "source_event_id" {{optional_inline}} : A string representing an ID for the attribution source, which can be used to map it to other information when the attribution source is interacted with, or aggregate information at the reporting endpoint. The string must consist solely of a base-10-formatted 64-bit unsigned integer. "destination" : A single string or an array of 1–3 strings. These strings must contain a complete URL corresponding to the {{glossary("site")}}, including the scheme, on which a trigger is expected to occur. These are used to match the attribution trigger to the source when a trigger is interacted with. "aggregation_keys" {{optional_inline}} : An object containing user-provided keys representing different data points to aggregate report values under. "aggregatable_report_window" {{optional_inline}} : A string representing a time in seconds after which trigger data will no longer be included in generated aggregatable reports (this is called a report window). If not set, this defaults to the "expiry" value. "debug_key" {{optional_inline}} : A base-10-formatted 64-bit unsigned integer representing a debug key. Set this if you want to generate a debug report alongside the associated attribution report. "debug_reporting" {{optional_inline}} : A boolean value. If a debug_key is set, set this to true to specify that the generated debug report should be a verbose debug report. "event_level_epsilon" {{optional_inline}} : A number equal to or greater than 0, which controls the amount of noise added to reports. Lower values of epsilon result in more noise and therefore provide greater privacy protection. The maximum and default values will vary across implementations; Chrome for example has a maximum and default value of 14. "event_report_window" {{optional_inline}} : A string representing a time in seconds, after which subsequent triggers won't be attributable to this source for the purpose of producing event-level reports (this is called a report window). If not set, the event report window falls back to the "expiry" value. > [!NOTE] > If "event_report_window" is specified, "event_report_windows" cannot be specified, otherwise the source registration will fail. … Attribution: Adapted from MDN Web Docs under CC-BY-SA-2.5. Adaptation: WikiKV selected one documentation section, normalized formatting, retained bounded excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.