By Clinton Wong
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Additional info for Web-Client Programming with PERL
All header information is given line by line, each line with a header name and value. 1N (Macintosh; I; 68K) Accept: */* Accept: image/gif Accept: image/x-xbitmap Accept: image/jpeg To end the header section, the client sends a blank line. There are many headers in HTTP. We will list all the valid headers in this chapter, but give special attention to several groupings of headers that may come in especially handy. Appendix A contains a more complete listing of HTTP headers. 3. When applicable, the client sends the data portion of the request.
1 requires that the client include a Host header in all transactions. Entity tags simplify the caching process by representing each server entity with a unique identifier called an entity tag. The If-match and If-none-match headers are used to compare two entities for equality or inequality. 0, caching is based on an entity's document path and modification time. Managing the cache becomes difficult when the same document exists in multiple locations on the server. 1, the document would have the same entity tag at each location.
With this result code, the Location header (described in Appendix A) is given by the server to specify where the new data was placed. 202 Accepted The request was accepted but not immediately acted upon. More information about the transaction may be given in the entity-body of the server's response. There is no guarantee that the server will actually honor the request, even though it may seem like a legitimate request at the time of acceptance. 203 Non-Authoritative Information The information in the entity header is from a local or third-party copy, not from the original server.