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Tuesday, March 18, 2014
Google uses a wide range of IP addresses for its different services, and the addresses may change
without notification.
Google App Engine
is a Platform as a Service offering which hosts a wide variety of 3rd party applications. This
post announces changes in the IP address range and headers used by the Google App Engine
URLFetch (outbound HTTP) and outbound sockets APIs.
While we recommend that App Engine IP ranges not be used to filter inbound requests, we are aware
that some services have created filters that rely on specific addresses. Google App Engine will be
changing its IP range beginning this month. Please see
these instructions
to determine App Engine's IP range.
Additionally, the HTTP
User-Agent header string
that historically allowed identification of individual App Engine applications should no longer
be relied on to identify the application. With the introduction of outbound
sockets for App Engine,
applications may now make HTTP requests without using the URLFetch API, and those
requests may set a User-Agent of their own choosing.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["Google App Engine is altering its IP address range, and users who filter inbound requests based on specific addresses should update their filters."],["The `User-Agent` header string can no longer be depended upon for identifying individual App Engine applications due to the introduction of outbound sockets."],["Google App Engine's outbound HTTP and sockets APIs will be utilizing a new IP address range and headers."],["Google App Engine hosts many third-party applications and its IP addresses can change, impacting users who rely on filtering by specific addresses."]]],[]]
