https://bz.apache.org/bugzilla/show_bug.cgi?id=64775
Bug ID: 64775
Summary: mod_jk is sending both Content-Length and
Transfer-Encoding
Product: Tomcat Connectors
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_jk
Assignee: dev@tomcat.apache.org
Reporter: s...@daemoninc.com
Target Milestone: ---
Our application uses "Transfer Encoding: chunked" and it started to hang after
upgrading mod_jk from 1.2.37 to 1.2.39. It's still broken in 1.2.48. Looking
at the headers it's because mod_jk is sending both of the following:
Transfer-Encoding: chunked
Content-Length: 0
Our app is assuming the content is zero-length and stops reading. In 1.2.37
both headers were present but Content-Length was empty instead of zero, which
our app had been ignoring.
Transfer-Encoding: chunked
Content-Length:
According to the HTTP spec the web server should never send both of these
headers in the same response. It looks like the patch in r1549202 started
sending a numeric Content-Length instead of an empty one which is when it broke
for us.
The following patch checks if the Content-Length is empty and if so doesn't
sent the header at all. With this patch I only see the Transfer-Encoding
header and no Content-Length.
--- tomcat-connectors-1.2.48-src.orig/native/apache-2.0/mod_jk.c
2020-02-20 11:43:15.000000000 -0500
+++ tomcat-connectors-1.2.48-src/native/apache-2.0/mod_jk.c 2020-09-18
10:56:14.564911842 -0400
@@ -395,7 +395,9 @@
apr_table_set(r->headers_out, header_names[h], header_values[h]);
}
else if (!strcasecmp(header_names[h], "Content-Length")) {
- ap_set_content_length(r, apr_atoi64(header_values[h]));
+ if (strlen(header_values[h]) > 0) {
+ ap_set_content_length(r, apr_atoi64(header_values[h]));
+ }
}
else if (!strcasecmp(header_names[h], "Transfer-Encoding")) {
apr_table_set(r->headers_out, header_names[h], header_values[h]);
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