https://bz.apache.org/bugzilla/show_bug.cgi?id=64598

--- Comment #2 from Ruediger Pluem <[email protected]> ---
Does the below patch fix your issue?

Index: modules/proxy/mod_proxy_uwsgi.c
===================================================================
--- modules/proxy/mod_proxy_uwsgi.c     (revision 1879840)
+++ modules/proxy/mod_proxy_uwsgi.c     (working copy)
@@ -175,7 +175,7 @@
     env = (apr_table_entry_t *) env_table->elts;

     for (j = 0; j < env_table->nelts; ++j) {
-        headerlen += 2 + strlen(env[j].key) + 2 + strlen(env[j].val);
+        headerlen += 2 + strlen(env[j].key) + 2 + env[j].val ?
strlen(env[j].val) : 0;
     }

     ptr = buf = apr_palloc(r->pool, headerlen);
@@ -189,10 +189,12 @@
         memcpy(ptr, env[j].key, keylen);
         ptr += keylen;

-        vallen = strlen(env[j].val);
+        vallen = env[j].val ? strlen(env[j].val) : 0;
         *ptr++ = (apr_byte_t) (vallen & 0xff);
         *ptr++ = (apr_byte_t) ((vallen >> 8) & 0xff);
-        memcpy(ptr, env[j].val, vallen);
+        if (env[j].val) {
+            memcpy(ptr, env[j].val, vallen);
+        }
         ptr += vallen;
     }

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