Document (#28035)

Author

Pothe, A.

Title

Nachgezählt : Wie groß ist das WWW?

Source

c't. 2004, H.26, S.164-165

Year

2004

Series

Report: Suchmaschinen-Abdeckung

Abstract

Mehr als 8 Milliarden Webseiten hat Google in seinem Index stehen - doch längst nicht jede Webseite wird von den Robots der Suchmaschinen besucht. Eine Studie für den Bereich der.de-Domains ermittelt, wie viele Seiten von keiner Suchmaschine gefunden werden.

Content

"Die verflixten dynamischen Seiten Viele Server erzeugen Seiten erst in dem Moment, in dem sie der Nutzer anfordert. Dabei greifen sie für die Inhalte auf Datenbanken zurück. Die dafür notwendigen Parameter werden bei der Anforderung der Seiten mit übermittelt. Für die Anforderung von WebSeiten kennt das HTTP-Protokoll zwei unterschiedliche Methoden - "GET" und "POST". Mit GET angeforderte dynamische Seiten erkennt man in der Regel leicht an den Parametern, die an die URL gehängt werden. Beispielsweise übergibt der Aufruf http://www.google.com/search?q=Beispiel an Google eine Suchanfrage (Parameter "q") nach dem Wort "Beispiel". Die Parameter sind durch ein Fragezeichen vom Seitennamen getrennt. Webserver können die Parameter aber auch verstecken, also ohne das Fragezeichen in der Adresse auswerten. Bei der Suchmaschine Fireball zum Beispiel zeigt die Seite http://suche.fireball.de/text/test/ dieselben Ergebnisse an wie die Seite http://suche.fireball.de/cgi-bin/pursuit?T query=test&cat=fbt loc&SITE=de Dynamische Seiten mit POSTParametern lassen sich nur schwer erkennen. Hier werden Daten nämlich nicht über die URL übergeben, sondern vom Browser in den Body der HTTPAnfrage geschrieben, wo sie für den Anwender üblicherweise nicht einsehbar sind. Aus diesem Grund lassen sich dynamische Seiten mit POST-Parametern auch nicht verlinken, da die POST-Parameter in einem normalen Link nicht mit übertragen werden. Die POST-Methode ermöglicht die Übertragung von größeren Datenmengen als GET. Da die Parameter nicht in der History stehen, bietet POST eine gewisse Sicherheit bei der Übertragung von heiklen Daten wie Kreditkartennummern. Dynamische Seiten machen das WWW unendlich groß. Das zeigt sich schon bei den Suchmaschinen, in deren Suchformulare beliebige Begriffe eingegeben werden können. Bei jedem neuen Begriff, bei der kleinsten Änderung der Suchdaten gibt die Suchmaschine eine andere Seite aus. Um genau diejenigen Seiten zu erfassen, die auch Suchrnaschinen indexieren können, bedarf es eines Kompromisses: Dynamische Seiten wurden nur gezählt, wenn sie nicht voraussetzen, dass für ihren Abruf ein Textfeld ausgefüllt wird. Sobald Seitengenerierungen aus Textfeldern unberücksichtigt bleiben, wird nur noch eine endliche Menge an Seiten untersucht. Seiten mit (sichtbaren wie unsichtbaren) GET-Parametern in der URL können Suchmaschinen dagegen indexieren. Bei der Untersuchung wurden dynamische Seiten mit sichtbaren Parametern ebenfalls nicht erfasst, sondern durch den Korrekturfaktor mit berücksichtigt."

Theme

Suchmaschinen

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4. Charlier, M.: Pingpong mit Pingback : Lass mich Deine Suchmaschine sein: Webseiten finden neue Wege der Vernetzung (2003) 0.29

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5. Korves, J.: Seiten bewerten : Googles PageRank (2005) 0.29

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