#174 修正HTTP1解析层在解析HTTP头部时，误采用前缀匹配判断头部是否为标准定义的问题。

* 原实现在判断请求/应答头部字段是否为标准头部时，没有判断传入字符串长度是否相等，导致当传入字符串为标准头部的前缀时误将其解析为标准头部；
* 现修正，增加判断字符串长度的流程，当字符串长度完全相等时再执行字符串匹配。

plugin/protocol/http/test/test_http_half.cpp

@@ -46,6 +46,7 @@ static const char * __get_http_request_no_body =
 	"GET /gfwlist/gfwlist/master/gfwlist.txt HTTP/1.1\r\n"
 	"Host: raw.githubusercontent.com\r\n"
 	"Connection: close\r\n"
+ 	"User: User-Test\r\n"
 	"User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36\r\n"
 	"Accept: */*\r\n"
 	"Accept-Encoding: gzip, deflate\r\n"
@@ -82,6 +83,12 @@ void __get_http_request_header_verify_helper(struct http_half_private * hf_priva
 	EXPECT_EQ(field_name.field_id, TFE_HTTP_CONNECTION);
 	EXPECT_STREQ(hdr_value, "close");
 
+	/* User */
+	hdr_value = tfe_http_field_iterate(hf_public, &__iterator, &field_name);
+	EXPECT_EQ(field_name.field_id, TFE_HTTP_UNKNOWN_FIELD);
+	EXPECT_STREQ(field_name.field_name, "User");
+	EXPECT_STREQ(hdr_value, "User-Test");
+
 	/* User-Agent */
 	hdr_value = tfe_http_field_iterate(hf_public, &__iterator, &field_name);
 	EXPECT_EQ(field_name.field_id, TFE_HTTP_USER_AGENT);