https://bz.apache.org/bugzilla/show_bug.cgi?id=67670
--- Comment #2 from Konstantin Kolinko <knst.koli...@gmail.com> ---
(In reply to M McClain from comment #0)
> diff --git a/java/org/apache/coyote/http11/Http11Processor.java
> b/java/org/apache/coyote/http11/Http11Processor.java
> index aab2290407..ac531ad105 100644
> --- a/java/org/apache/coyote/http11/Http11Processor.java
> +++ b/java/org/apache/coyote/http11/Http11Processor.java
> @@ -914,12 +914,6 @@ public class Http11Processor extends AbstractProcessor {
> ...
>
> - // Check for compression
> - boolean useCompression = false;
> - if (entityBody && sendfileData == null) {
> - useCompression = protocol.useCompression(request, response);
> - }
> ...
> @@ -956,8 +950,11 @@ public class Http11Processor extends AbstractProcessor {
The lines between the two chunks in the diff above in Http11Processor are
responsible for setting the "Content-Length" header.
>930: long contentLength = response.getContentLengthLong();
>...
>937: } else if (contentLength != -1) {
>938: headers.setValue("Content-Length").setLong(contentLength);
The "protocol.useCompression(request, response)" call goes down to
org.apache.coyote.CompressionConfig#useCompression(...) that does
> // Compressed content length is unknown so mark it as such.
> response.setContentLength(-1);
> // Configure the content encoding for compressed content
> responseHeaders.setValue("Content-Encoding").setString("gzip");
As the "useCompression" was moved by that commit, line 930 no longer sees the
correct contentLength value.
Note: The workaround for this issue is to turn off compression on a Connector.
(Remove the "compression" attribute from a <Connector> element, or set it to
"off").
https://tomcat.apache.org/tomcat-9.0-doc/config/http.html#Standard_Implementation
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