Fix some libevhtp usage details.

Path improperly fetched from request object.
Bump libevhtp version in order to work around
https://github.com/ellzey/libevhtp/issues/167

Change-Id: Ic53b72c7eea5c3480537f3c69c73b908940726dd
Bug: 26986898
Reviewed-on: https://weave-review.googlesource.com/2512
Reviewed-by: Vitaly Buka <vitalybuka@google.com>

examples/provider/event_http_server.cc

diff --git a/examples/provider/event_http_server.cc b/examples/provider/event_http_server.cc
index 1bf58f6..c058401 100644
--- a/examples/provider/event_http_server.cc
+++ b/examples/provider/event_http_server.cc
@@ -38,7 +38,7 @@
 
   ~RequestImpl() {}
 
-  std::string GetPath() const override { return req_->uri->path->path; }
+  std::string GetPath() const override { return req_->uri->path->full; }
 
   std::string GetFirstHeader(const std::string& name) const override {
     const char* header = evhtp_header_find(req_->headers_in, name.c_str());
@@ -132,7 +132,7 @@
 
 void HttpServerImpl::NotFound(evhtp_request_t* req) {
   EventPtr<evbuffer> buf{evbuffer_new()};
-  evbuffer_add_printf(buf.get(), "404 Not Found: %s\n", req->uri->path->path);
+  evbuffer_add_printf(buf.get(), "404 Not Found: %s\n", req->uri->path->full);
   evhtp_send_reply_start(req, 404);
   evhtp_send_reply_body(req, buf.get());
   evhtp_send_reply_end(req);

third_party/get_libevhtp.sh

diff --git a/third_party/get_libevhtp.sh b/third_party/get_libevhtp.sh
index c270813..cfcada9 100755
--- a/third_party/get_libevhtp.sh
+++ b/third_party/get_libevhtp.sh
@@ -9,17 +9,19 @@
 cd $(dirname "$0")
 THIRD_PARTY=$(pwd)
 
+LIBEVHTP_VERSION=1.2.11n
+
 mkdir -p include lib
 
 rm -rf $THIRD_PARTY/libevhtp
-curl -L https://github.com/ellzey/libevhtp/archive/1.2.10.tar.gz | tar xz || exit 1
-mv libevhtp-1.2.10 $THIRD_PARTY/libevhtp || exit 1
+curl -L https://github.com/ellzey/libevhtp/archive/$LIBEVHTP_VERSION.tar.gz | tar xz || exit 1
+mv libevhtp-$LIBEVHTP_VERSION $THIRD_PARTY/libevhtp || exit 1
 cd $THIRD_PARTY/libevhtp || exit 1
 
 cmake -D EVHTP_DISABLE_REGEX:BOOL=ON . || exit 1
 make evhtp || exit 1
 
-cp -rf evhtp-config.h evhtp.h evthr/evthr.h htparse/htparse.h $THIRD_PARTY/include/ || exit 1
+cp -rf *.h $THIRD_PARTY/include/ || exit 1
 cp -f libevhtp.a $THIRD_PARTY/lib/ || exit 1
 
 rm -rf $THIRD_PARTY/libevhtp