duandiaoqian5795 2018-09-13 23:27
浏览 421


The http request header has a 4k length limit. I want to split the string which I want to include in the header based on this limit. Should I use []byte(str) to split first then convert back to string using string([]byte) for each split part? Is there any simpler way to do it?

  • 写回答

1条回答 默认 最新

  • dqwyghl0649 2018-09-14 00:30

    In Go, a string is really just a sequence of bytes, and indexing a string produces bytes. So you could simply split your string into substrings by slicing it into 4kB substrings.

    However, since UTF-8 characters can span multiple bytes, there is the chance that you will split in the middle of a character sequence. This isn't a problem if the split strings will always be joined together again in the same order at the other end before decoding, but if you try to decode each individually, you might end up with invalid leading or trailing byte sequences. If you want to guard against this, you could use the unicode/utf8 package to check that you are splitting on a valid leading byte, like this:

    package httputil
    import "unicode/utf8"
    const maxLen = 4096
    func SplitHeader(longString string) []string {
        splits := []string{}
        var l, r int
        for l, r = 0, maxLen; r < len(longString); l, r = r, r+maxLen {
            for !utf8.RuneStart(longString[r]) {
            splits = append(splits, longString[l:r])
        splits = append(splits, longString[l:])
        return splits

    Slicing the string directly is more efficient than converting to []byte and back because, since a string is immutable and a []byte isn't, the data must be copied to new memory upon conversion, taking O(n) time (both ways!), whereas slicing a string simply returns a new string header backed by the same array as the original (taking constant time).

    本回答被题主选为最佳回答 , 对您是否有帮助呢?



  • ¥50 易语言把MYSQL数据库中的数据添加至组合框
  • ¥20 求数据集和代码#有偿答复
  • ¥15 关于下拉菜单选项关联的问题
  • ¥20 java-OJ-健康体检
  • ¥15 rs485的上拉下拉,不会对a-b<-200mv有影响吗,就是接受时,对判断逻辑0有影响吗
  • ¥15 使用phpstudy在云服务器上搭建个人网站
  • ¥15 应该如何判断含间隙的曲柄摇杆机构,轴与轴承是否发生了碰撞?
  • ¥15 vue3+express部署到nginx
  • ¥20 搭建pt1000三线制高精度测温电路
  • ¥15 使用Jdk8自带的算法,和Jdk11自带的加密结果会一样吗,不一样的话有什么解决方案,Jdk不能升级的情况