Fix bug when the value of http header is empty (#2888)

* Fix bug when the value of http header is empty

* add utest

trunk/src/protocol/srs_service_http_conn.cpp

@@ -263,12 +263,12 @@ int SrsHttpParser::on_header_value(http_parser* parser, const char* at, size_t l
 
     if (length > 0) {
         obj->field_value.append(at, (int)length);
-    }
 
-    // When header parsed, we must save the position of start for body,
-    // because we have to consume the header in buffer.
-    // @see https://github.com/ossrs/srs/issues/1508
-    obj->p_header_tail = at;
+        // When header parsed, we must save the position of start for body,
+        // because we have to consume the header in buffer.
+        // @see https://github.com/ossrs/srs/issues/1508
+        obj->p_header_tail = at;
+    }
 
     srs_info("Header value(%d bytes): %.*s", (int)length, (int)length, at);
     return 0;

trunk/src/utest/srs_utest_http.cpp

@@ -143,6 +143,16 @@ string mock_http_response2(int status, string content)
     return ss.str();
 }
 
+string mock_http_response3(int status, string content)
+{
+    stringstream ss;
+    ss << "HTTP/1.1 " << status << " " << srs_generate_http_status_text(status) << "\r\n"
+        << "Server:" << "\r\n"
+        << "\r\n"
+        << content;
+    return ss.str();
+}
+
 bool is_string_contain(string substr, string str)
 {
     return (string::npos != str.find(substr));
@@ -528,6 +538,17 @@ VOID TEST(ProtocolHTTPTest, ClientRequest)
         EXPECT_STREQ("Hello, world!", res.c_str());
         srs_freep(msg);
     }
+
+    // Normal case, with empty server.
+    if(true) {
+        MockBufferIO io; io.append(mock_http_response3(200, "Hello, world!"));
+        SrsHttpParser hp; HELPER_ASSERT_SUCCESS(hp.initialize(HTTP_RESPONSE));
+        ISrsHttpMessage* msg = NULL; HELPER_ASSERT_SUCCESS(hp.parse_message(&io, &msg));
+        string res; HELPER_ASSERT_SUCCESS(msg->body_read_all(res));
+        EXPECT_EQ(200, msg->status_code());
+        EXPECT_STREQ("Hello, world!", res.c_str());
+        srs_freep(msg);
+    }
 }
 
 VOID TEST(ProtocolHTTPTest, ResponseHTTPError)