javascript - 是否可以从 json 读取第一行或 n 个字符而不下载所有数据？

Question

我必须从 json 文件中获取一些信息。 json 文件大小为 450 KB。但我不需要所有 json 文件，所以我不想下载 json。问题是是否可以从 json 文件中读取 n 个字符或逐行读取而不下载所有文件？如果可以的话怎么办？

Answer 1

您可以尝试HTTP Range header .

This document defines HTTP/1.1 range requests, partial responses, andthe multipart/byteranges media type. Range requests are an OPTIONAL
feature of HTTP, designed so that recipients not implementing this
feature (or not supporting it for the target resource) can respond asif it is a normal GET request without impacting interoperability.
Partial responses are indicated by a distinct status code to not be
mistaken for full responses by caches that might not implement the
feature.