5 string references to http_client

AnnounceTestBase::setTestFeedResponses in core/modules/announcements_feed/tests/src/Kernel/AnnounceTestBase.php
Sets test feed responses.
DevReleaseTest::setReleaseMetadata in core/modules/update/tests/src/Kernel/DevReleaseTest.php
Sets the release metadata file to use when fetching available updates.
Drupal::httpClient in core/lib/Drupal.php
Returns the default http client.
DrupalTest::testHttpClient in core/tests/Drupal/Tests/Core/DrupalTest.php
Tests the httpClient() method.
UpdateCalculateProjectDataTest::setReleaseMetadata in core/modules/update/tests/src/Kernel/UpdateCalculateProjectDataTest.php
Sets the release metadata file to use when fetching available updates.

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