Apply range header base on response status code

Author: xyhuang7215

httplib.h

@@ -590,7 +590,6 @@ struct Response {
   Headers headers;
   std::string body;
   std::string location; // Redirect location
-  bool ignore_range = false;
 
   bool has_header(const std::string &key) const;
   std::string get_header_value(const std::string &key, size_t id = 0) const;
@@ -6503,7 +6502,7 @@ inline bool Server::dispatch_request(Request &req, Response &res,
 inline void Server::apply_ranges(const Request &req, Response &res,
                                  std::string &content_type,
                                  std::string &boundary) const {
-  if (req.ranges.size() > 1 && !res.ignore_range) {
+  if (req.ranges.size() > 1 && res.status == StatusCode::PartialContent_206) {
     auto it = res.headers.find("Content-Type");
     if (it != res.headers.end()) {
       content_type = it->second;
@@ -6521,7 +6520,7 @@ inline void Server::apply_ranges(const Request &req, Response &res,
   if (res.body.empty()) {
     if (res.content_length_ > 0) {
       size_t length = 0;
-      if (req.ranges.empty() || res.ignore_range) {
+      if (req.ranges.empty() || res.status != StatusCode::PartialContent_206) {
         length = res.content_length_;
       } else if (req.ranges.size() == 1) {
         auto offset_and_length = detail::get_range_offset_and_length(
@@ -6550,7 +6549,7 @@ inline void Server::apply_ranges(const Request &req, Response &res,
       }
     }
   } else {
-    if (req.ranges.empty() || res.ignore_range) {
+    if (req.ranges.empty() || res.status != StatusCode::PartialContent_206) {
       ;
     } else if (req.ranges.size() == 1) {
       auto offset_and_length =

test/test.cc

@@ -1873,7 +1873,6 @@ class ServerTest : public ::testing::Test {
              })
         .Get("/with-range-customized-response",
              [&](const Request & /*req*/, Response &res) {
-              res.ignore_range = true;
               res.status = StatusCode::BadRequest_400;
               res.set_content(JSON_DATA,  "application/json");
              })