| Name | Description | Type | Package | Framework |
| AbstractHttpMessage | Basic implementation of HttpMessage. | Class | apache.http.message | Apache HttpComponents |
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| BasicHeader | Basic implementation of Header. | Class | apache.http.message | Apache HttpComponents |
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| BasicHeaderElement | | Class | apache.http.message | Apache HttpComponents |
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| BasicHeaderElementIterator | Basic implementation of a HeaderElementIterator. | Class | apache.http.message | Apache HttpComponents |
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| BasicHeaderIterator | Basic implementation of a HeaderIterator. | Class | apache.http.message | Apache HttpComponents |
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| BasicHeaderValueFormatter | Basic implementation for formatting header value elements. | Class | apache.http.message | Apache HttpComponents |
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| BasicHeaderValueParser | Basic implementation for parsing header values into elements. | Class | apache.http.message | Apache HttpComponents |
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| BasicHttpEntityEnclosingRequest | Basic implementation of HttpEntityEnclosingRequest. | Class | apache.http.message | Apache HttpComponents |
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| BasicHttpRequest | Basic implementation of HttpRequest. | Class | apache.http.message | Apache HttpComponents |
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| BasicHttpResponse | Basic implementation of HttpResponse. | Class | apache.http.message | Apache HttpComponents |
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| BasicLineFormatter | Interface for formatting elements of the HEAD section of an HTTP message. | Class | apache.http.message | Apache HttpComponents |
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| BasicLineParser | Basic parser for lines in the head section of an HTTP message. | Class | apache.http.message | Apache HttpComponents |
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| BasicListHeaderIterator | For use by HeaderGroup. | Class | apache.http.message | Apache HttpComponents |
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| BasicNameValuePair | Basic implementation of NameValuePair. | Class | apache.http.message | Apache HttpComponents |
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| BasicRequestLine | Basic implementation of RequestLine. | Class | apache.http.message | Apache HttpComponents |
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| BasicStatusLine | Basic implementation of StatusLineSince:4. | Class | apache.http.message | Apache HttpComponents |
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| BasicTokenIterator | Basic implementation of a TokenIterator. | Class | apache.http.message | Apache HttpComponents |
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| BufferedHeader | This class represents a raw HTTP header whose content is parsed 'on demand' only when the header value needs to be consumed. | Class | apache.http.message | Apache HttpComponents |
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| HeaderGroup | A class for combining a set of headers. | Class | apache.http.message | Apache HttpComponents |
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| HeaderValueFormatter | Interface for formatting elements of a header value. | Interface | apache.http.message | Apache HttpComponents |
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| HeaderValueParser | Interface for parsing header values into elements. | Interface | apache.http.message | Apache HttpComponents |
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| LineFormatter | Interface for formatting elements of the HEAD section of an HTTP message. | Interface | apache.http.message | Apache HttpComponents |
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| LineParser | Interface for parsing lines in the HEAD section of an HTTP message. | Interface | apache.http.message | Apache HttpComponents |
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| MessageConstraintException | Signals a message constraint violation. | Class | apache.http | Apache HttpComponents |
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| ParserCursor | This class represents a context of a parsing operation: the current position the parsing operation is expected to start atthe bounds limiting the scope of the parsing operation | Class | apache.http.message | Apache HttpComponents |
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| TokenParser | Low level parser for header field elements. | Class | apache.http.message | Apache HttpComponents |