There are multiple ways for creating a custom tabs intent. # Create Custom Tab Intent with Extra Headers For the link relation use "delegate_permission/e_as_origin"` which indicates that both apps belong to the same origin once the link is verified.
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To allow non-whitelisted headers to be passed through custom tab intents, it is necessary to set up a digital asset link between the android and web application that verifies that the author owns both applications.įollow the official guide to set up a digital asset link. # Adding Extra Headers to CustomTab Intents # Set up digital asset links
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The next section shows how to set these up and launch a Custom Tabs intent with the required headers. The supported way of including non-whitelisted headers in custom tabs is to first verify the cross-origin connection using a digital access link. Although other browsers may have different behaviour, developers should expect non-whitelisted headers to be blocked in general. However, Chrome filters non-whitelisted headers by default. We can always attach whitelisted headers to custom tabs CORS requests. putString ( "redirect-url", "Some redirect url" ) putString ( "bearer-token", "Some token" ) You can also attach headers to these intents using a Bundle with the Borwser.EXTRA_HEADERS flag: CustomTabsIntent intent = new CustomTabsIntent. Custom Tab intents can be created using CustomTabsIntent.Builder(). # Attaching CORS whitelisted headers to Custom Tabs requestsĬustom Tabs are a special way of launching web pages in a customised browser tab. The cookies could authenticate malicious server transactions that would otherwise not be possible. Sending non-whitelisted headers from cross-origin domains would allow malicious third-party apps to craft headers that misuse user cookies that Chrome (or another browser) stores and attaches to requests. Table 3.: Example non-whitelisted CORS headers.Īttaching non-whitelisted headers to CORS requests is discouraged by the HTML standard and servers assume that cross-origin requests contain only whitelisted headers. This behaviour is summarised in the following table: Starting with Chrome 86, it is possible to attach non-whitelisted headers to cross-origin requests, when the server and client are related using a digital asset link. From version 83 onward, Chrome started filtering all except whitelisted cross-origin headers, since non-whitelisted headers posed a security risk. Until Chrome 83, developers could add any headers when launching a Custom Tab. intents launched from apps that open a URL in the browser tab. This guide discusses launching such requests through Chrome custom tabs, i.e. For security reasons, Chrome filters some of the extra headers depending on how and where an intent is launched.Ĭross-origin requests require an additional layer of security as the client and server are not owned by the same party. Apart from headers attached by browsers, Android apps may add extra headers, like Cookie or Referrer through the EXTRA_HEADERS Intent extra. HTTP requests contain headers such as User-Agent or Content-Type.
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