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?
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根据golang中的字节长度分割字符串
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1条回答 默认 最新
- dqwyghl0649 2018-09-14 00:30关注
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]) { 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 astring
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?解决 无用评论 打赏 举报
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