5.9 Miscellaneous Utilities

Web Server: PLT HTTP Server

5

5.1	Timers
5.2	Connection Manager
5.3	Serializable Closures
5.4	Cache Table
5.5	MIME Types
5.6	Serialization Utilities
5.7	URL Param
5.8	GZip
5.9	Miscellaneous Utilities

5.9

Miscellaneous Utilities

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5.9 Miscellaneous Utilities

(require web-server/private/util)

There are a number of other miscellaneous utilities the Web Server needs. They are provided by this module.

5.9.1 Contracts

non-empty-string/c : contract?

Contract for non-empty strings.

port-number? : contract?

Equivalent to (between/c 1 65535).

path-element? : contract?

Equivalent to (or/c path-string? (symbols 'up 'same)).

5.9.2 Lists

(list-prefix? l r) → boolean?

l : list?

r : list?

True if l is a prefix of r.

5.9.3 URLs

(url-replace-path proc u) → url?

proc : ((listof path/param?) . -> . (listof path/param?))

u : url?

Replaces the URL path of u with proc of the former path.

(url-path->string url-path) → string?

url-path : (listof path/param?)

Formats url-path as a string with "/" as a delimiter and no params.

5.9.4 Paths

(explode-path* p) → (listof path-element?)

p : path-string?

Like normalize-path, but does not resolve symlinks.

(path-without-base base p) → (listof path-element?)

base : path-string?

p : path-string?

Returns, as a list, the portion of p after base, assuming base is a prefix of p.

(directory-part p) → path?

p : path-string?

Returns the directory part of p, returning (current-directory) if it is relative.

(build-path-unless-absolute base p) → path?

base : path-string?

p : path-string?

Prepends base to p, unless p is absolute.

(strip-prefix-ups p) → (listof path-element?)

p : (listof path-element?)

Removes all the prefix ".."s from p.

5.9.5 Exceptions

(network-error s fmt v ...) → void

s : symbol?

fmt : string?

v : any/c

Like error, but throws a exn:fail:network.

(exn->string exn) → string?

exn : (or/c exn? any/c)

Formats exn with (error-display-handler) as a string.

5.9.6 Strings

(lowercase-symbol! sb) → symbol?

sb : (or/c string? bytes?)

Returns sb as a lowercase symbol.

(read/string s) → serializable?

s : string?

reads a value from s and returns it.

(write/string v) → string?

v : serializable?

writes v to a string and returns it.

5.9.7 Bytes

(bytes-ci=? b1 b2) → boolean?

b1 : bytes?

b2 : bytes?

Compares two bytes case insensitively.

(read/bytes b) → serializable?

b : bytes?

reads a value from b and returns it.

(write/bytes v) → bytes?

v : serializable?

writes v to a bytes and returns it.

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