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I'm wondering if there is an enum type in some standard Java class library that defines symbolic constants for all of the valid HTTP response codes. It should support conversion to/from the corresponding integer values.

I'm debugging some Java code that uses javax.ws.rs.core.Response.Status. It works, but it only defines about half of the valid HTTP response codes.

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7 Answers

up vote 27 down vote accepted

I don't think there's one that's complete in the standard Java classes; HttpURLConnection is missing quite a few codes, like HTTP 100/Continue. There's a complete list in the Apache Commons, though: org.apache.commons.HttpClient.HttpStatus.

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There's is no such a thing as "complete list", as status codes can be and do get extended. – Julian Reschke Mar 22 '12 at 7:14
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@JulianReschke I think "complete" here should be taken to mean "conforms to all the codes outlined by the standard". – John Feminella Mar 22 '12 at 15:19
John: "the standard" does not define "all" the status codes. That's why there is a registry. – Julian Reschke Mar 23 '12 at 20:58
iana.org/assignments/http-status-codes/http-status-codes.xml have a big list including the code=100 – Garis M Suero Mar 27 at 19:11
up vote 7 down vote

The Interface javax.servlet.http.HttpServletResponse from the servlet API has all the response codes in the for of int constants names SC_<description>. See http://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletResponse.html

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Depends on how you define "all". – Julian Reschke Apr 8 '09 at 15:39
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HttpServletResponse supports the RFC1945 and part of RFC2616 standards, but it's missing all of RFC2518. If you need a complete list, see HttpStatus as I mentioned. – John Feminella Apr 9 '09 at 3:57
up vote 6 down vote

If you're using Spring, the 3.x release has what your looking for: http://static.springsource.org/spring/docs/3.0.x/api/org/springframework/http/HttpStatus.html

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up vote 2 down vote

Well, there are static constants of the exact integer values in the HttpURLConnection class

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up vote 2 down vote

Also check out the Restlet Status class:

http://www.restlet.org/documentation/1.1/api/org/restlet/data/Status.html

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Again; status codes are extensible, so there can't be a "complete" list, unless it's revised everytime a new status code is added to the IANA registry (iana.org/assignments/http-status-codes) – Julian Reschke Jan 26 '10 at 12:52
up vote 0 down vote

Use javax.servlet.http.HttpServletResponse class

Example:

javax.servlet.http.HttpServletResponse.SC_UNAUTHORIZED //401
javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR //500
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for client development, it's burdensome to include the entire servlet API just to pick up these codes. – Jeffrey Blattman Jan 11 at 20:10
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The best provider for http status code constants is likely to be Jetty's org.eclipse.jetty.http.HttpStatus class because:

  • there is a javadoc package in maven which is important if you search for the constant and only know the number -> just open the api docs page and search for the number
  • the constants contain the status code number itself.

Only thing I would improve: put the status code number in front of the text description in order to make auto-completion lookup more convient when you are starting with the code.

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