Unverified50% confidenceFactExact time
The HTTP/1.1 specification (RFC 7230) stipulates that request header field names are case-insensitive.
1
Sources
50%
Confidence
Long-term
Relevance
10/4/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedAccording to DNS specification RFC 1035, domain name labels only allow letters, digits, and hyphens, totaling approximately 63 legal characters including the dot separator.71% similarUnverifiedThe User-Agent field in HTTP requests is declared by the client itself; the HTTP protocol has not introduced any authentication mechanism for this field, and anyone can freely forge it.60% similarUnverifiedHTTP status code 400 indicates a malformed request body, 401 indicates invalid or missing credentials, 403 indicates insufficient permissions, 429 indicates a rate limit has been triggered, and 5xx points to server-side issues.58% similarUnverifiedTXT记录最初在RFC 1035中定义,设计目的是存储与域名相关的任意文本信息57% similarUnverified许多网站的表单验证会拒绝包含加号的邮箱地址,认为其格式无效56% similar
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