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Disable Expect 100-Continue by default in Apache 5 HTTP client #6828

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Disable Expect 100-Continue by default in Apache 5 HTTP client #6828

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a2977ae
Disable Expect 100-Continue by default in Apache 5 HTTP client
alextwoods Mar 30, 2026
37ffbad
Fix docs
alextwoods Mar 30, 2026
0c35542
Update changelog catagory
alextwoods Mar 31, 2026
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6 changes: 6 additions & 0 deletions .changes/next-release/feature-AWSSDKforJavav2-b18ecdd.json
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@@ -0,0 +1,6 @@
{
"type": "feature",
"category": "Apache 5 HTTP Client",
"contributor": "",
"description": "Disable Expect 100-Continue by default in the Apache5 HTTP Client."
}
3 changes: 2 additions & 1 deletion ...s/apache5-client/src/main/java/software/amazon/awssdk/http/apache5/Apache5HttpClient.java
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Expand Up @@ -445,7 +445,8 @@ public interface Builder extends SdkHttpClient.Builder<Apache5HttpClient.Builder
Builder localAddress(InetAddress localAddress);

/**
* Configure whether the client should send an HTTP expect-continue handshake before each request.
* Configure whether the client should send an HTTP expect-continue handshake before each request. By default
* this is disabled.
*/
Builder expectContinueEnabled(Boolean expectContinueEnabled);

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2 changes: 1 addition & 1 deletion ...ient/src/main/java/software/amazon/awssdk/http/apache5/internal/DefaultConfiguration.java
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Expand Up @@ -22,7 +22,7 @@
*/
@SdkInternalApi
public final class DefaultConfiguration {
public static final Boolean EXPECT_CONTINUE_ENABLED = Boolean.TRUE;
public static final Boolean EXPECT_CONTINUE_ENABLED = Boolean.FALSE;

private DefaultConfiguration() {
}
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7 changes: 4 additions & 3 deletions services/s3/src/main/java/software/amazon/awssdk/services/s3/S3Configuration.java
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Expand Up @@ -234,10 +234,11 @@ public boolean chunkedEncodingEnabled() {
* By default, the SDK sends the {@code Expect: 100-continue} header for these operations, allowing the server to
* reject the request before the client sends the full payload. Setting this to {@code false} disables this behavior.
* <p>
* <b>Note:</b> When using the Apache HTTP client, the Apache client also independently adds the
* <b>Note:</b> When using the {@code ApacheHttpClient} (Apache 4), the Apache 4 client also independently adds the
* {@code Expect: 100-continue} header by default via its own {@code expectContinueEnabled} setting. To fully
* suppress the header on the wire, you must also disable it on the Apache HTTP client builder using
* {@code ApacheHttpClient.builder().expectContinueEnabled(false)}.
* suppress the header on the wire, you must also disable it on the Apache4 HTTP client builder using
* {@code ApacheHttpClient.builder().expectContinueEnabled(false)}. This does NOT apply to the {@code Apache5HttpClient}
* which defaults {@code expectContinueEnabled} to false.
*
* @return True if the Expect: 100-continue header is enabled.
* @see S3Configuration.Builder#expectContinueEnabled(Boolean)
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