Oleg Kalnichevski commented on HTTPCORE-512:

(1) I see no such thing in 
 in master, which is the only branch of HttpCore expected to be compliant with 
RFC 7230.
 in the 4.4.x branch adds {{Content-Length: 0}} header _only_ if the request 
method is expected to enclose an entity (the request object implements 
{{HttpEntityEnclosingRequest}} interface). This applies to PUT and POST methods 
only in the stock version of HttpCore. Moreover, the 4.4.x branch of HttpCore 
is expected to be compliant with RFC 2616 only.

> GET request should not include Content-Length header
> ----------------------------------------------------
>                 Key: HTTPCORE-512
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-512
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>            Reporter: Daniel Dyląg
>            Priority: Major
> According to RFC 7230, chapter 3.3.2:
> {noformat}
>  A user agent SHOULD NOT send a Content-Length header field when the request 
> message does not contain a payload body and the method semantics do not 
> anticipate such a body.
> {noformat}
> This most importantly includes GET method. Instead, in RequestContent class, 
> this header is always added if there is no entity. 
> {code:java}
> if (entity == null) {
>  request.addHeader(HTTP.CONTENT_LEN, "0");
>  return;
> }{code}
> Some servers take advantage of this rule and make incorrect assumptions when 
> dealing with requests from this library.

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