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Historically, the App Engine standard environment provided several scalable, proprietary services
for app development. These services were bundled with
first-generation runtimes
(also called
App Engine legacy runtimes), which include
Python 2,
Java 8,
Go 1.11, and
PHP 5.5. Because several
of the legacy runtimes are no longer maintained by their respective
open-source communities, as an App Engine developer, you may face hard choices
on whether to invest time and effort in migrating to a newer runtime or else
incur growing costs to retain your app on a legacy runtime.
Recognizing this challenge, Google Cloud is committed to providing you with a
more incremental migration path to newer runtimes. To reduce runtime migration
complexity, Google Cloud now supports a set of App Engine legacy bundled services and
their associated APIs on second-generation runtimes, which include
Python 3,
Java 11+,
Go 1.12+, and
PHP 7+. Your app
can call legacy bundled services APIs for second-generation runtimes through
language-idiomatic libraries.
Figure 1. How apps access the App Engine legacy bundled services
In runtime migration scenarios, you often also have the option to use
Google Cloud products that offer similar functionality as the
legacy bundled services. For the legacy bundled services that are not available as
separate products in Google Cloud, such as image processing, search, and
messaging, you can use third-party providers or other workarounds as suggested
in the Runtimes guide.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-05 UTC."],[[["App Engine's standard environment historically offered proprietary services bundled with first-generation runtimes like Python 2, Java 8, Go 1.11, and PHP 5.5."],["Google Cloud acknowledges the challenges of migrating from legacy runtimes and now supports legacy bundled services and their APIs on second-generation runtimes, including Python 3, Java 11+, Go 1.12+, and PHP 7+."],["For runtime migration, developers can either use App Engine's legacy bundled service APIs on newer runtimes, or utilize similar Google Cloud products."],["For legacy services not offered as separate Google Cloud products, such as image processing, developers can explore third-party providers or other solutions."]]],[]]
