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verifyValidHeaderValueAsciiString() — netty Function Reference

Architecture documentation for the verifyValidHeaderValueAsciiString() function in HttpHeaderValidationUtil.java from the netty codebase.

Function java ProtocolCodecs HTTP called by 1

Entity Profile

Dependency Diagram

graph TD
  a1048fa8_e69c_cc4e_36cb_ac59dd6fea9f["verifyValidHeaderValueAsciiString()"]
  f369fc32_9e23_f7f4_8a18_b9a88f492d8b["HttpHeaderValidationUtil"]
  a1048fa8_e69c_cc4e_36cb_ac59dd6fea9f -->|defined in| f369fc32_9e23_f7f4_8a18_b9a88f492d8b
  dd19c814_50c0_5afa_cb7c_3118cbf1a000["validateValidHeaderValue()"]
  dd19c814_50c0_5afa_cb7c_3118cbf1a000 -->|calls| a1048fa8_e69c_cc4e_36cb_ac59dd6fea9f
  style a1048fa8_e69c_cc4e_36cb_ac59dd6fea9f fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderValidationUtil.java lines 115–139

    private static int verifyValidHeaderValueAsciiString(AsciiString value) {
        // Validate value to field-content rule.
        //  field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
        //  field-vchar    = VCHAR / obs-text
        //  VCHAR          = %x21-7E ; visible (printing) characters
        //  obs-text       = %x80-FF
        //  SP             = %x20
        //  HTAB           = %x09 ; horizontal tab
        //  See: https://datatracker.ietf.org/doc/html/rfc7230#section-3.2
        //  And: https://datatracker.ietf.org/doc/html/rfc5234#appendix-B.1
        final byte[] array = value.array();
        final int start = value.arrayOffset();
        int b = array[start] & 0xFF;
        if (b < 0x21 || b == 0x7F) {
            return 0;
        }
        int end = start + value.length();
        for (int i = start + 1; i < end; i++) {
            b = array[i] & 0xFF;
            if (b < 0x20 && b != 0x09 || b == 0x7F) {
                return i - start;
            }
        }
        return -1;
    }

Domain

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Source

Frequently Asked Questions

What does verifyValidHeaderValueAsciiString() do?
verifyValidHeaderValueAsciiString() is a function in the netty codebase, defined in codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderValidationUtil.java.
Where is verifyValidHeaderValueAsciiString() defined?
verifyValidHeaderValueAsciiString() is defined in codec-http/src/main/java/io/netty/handler/codec/http/HttpHeaderValidationUtil.java at line 115.
What calls verifyValidHeaderValueAsciiString()?
verifyValidHeaderValueAsciiString() is called by 1 function(s): validateValidHeaderValue.

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